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Friday, November 20, 2020 | History

3 edition of Inelastic strain analysis of solder joint in NASA fatigue specimen found in the catalog.

Inelastic strain analysis of solder joint in NASA fatigue specimen

Inelastic strain analysis of solder joint in NASA fatigue specimen

final report

by

  • 219 Want to read
  • 34 Currently reading

Published by University of Maryland, NASA Goddard Space Flight Center in College Park, MD, [Greenbelt, MD] .
Written in English

    Subjects:
  • Strains and stresses.,
  • Solder and soldering.,
  • Creep analysis.,
  • Elastic properties.,
  • Fatigue (Materials),
  • Fatigue life.,
  • Finite element method.,
  • Plastic properties.,
  • Solders.,
  • Thermal cycling tests.,
  • Viscoplasticity.

  • Edition Notes

    Microfiche. [Washington, D.C.] : National Aeronautics and Space Administration, [1991]. 1 microfiche.

    Statementprepared by Abhijit Dasgupta, Chen Oyan.
    SeriesNASA-CR -- 187864., NASA contractor report -- NASA CR-187864.
    ContributionsOyan, Chen., University of Maryland, College Park., Goddard Space Flight Center.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL16138640M

    Assessment of Solder Joint Fatigue Life Under Realistic Service Conditions SA’D HAMASHA,1,3 YOUNIS JARADAT,1 AWNI QASAIMEH,2 MAZIN OBAIDAT,1 and PETER BORGESEN1 1.—Department of Systems Science & Industrial Engineering, Binghamton University, P.O. Box. analysis procedure for fatigue life analysis under coupled dynamic and thermal loads. The purpose of the study has been to observe the contribution of thermal and vibration induced strains to the fatigue life of solder joints. The fatigue life of the solder joint was determined by Miner’s rule and also by coupled finite element analyses. Modal Analysis Is Done First to Verify the Frequency Requirements Joint Is 0. Solder Fatigue with PWB Assembly Model – Shang. Regional ANSYS Conference Solder Joint CDI. Solder CDI on + Joints BGA CDI Details. Solder File Size: KB. Strain age Soldering Techniues Strain ages and Instruments For technical support, contact in both stress analysis laboratories and in transducer manufacture. and then the leadwire joint can be completed using the same solder and M-Flux AR rosin flux or a rosin-cored Size: KB.


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Inelastic strain analysis of solder joint in NASA fatigue specimen Download PDF EPUB FB2

Inelastic Strain Analysis of Solder Joint in NASA Fatigue Specimen. The solder fatigue specimen designed by NASA-GSFC/UNISYS is analyzed in order to obtain the inelastic strain history during two different representative temperature cycles specified by UNISYS.

In previous reports (dated Jand Novem ), results were Author: Chen Oyan and Abhijit Dasgupta. Get this from a library. Inelastic strain analysis of solder joint in NASA fatigue specimen: final report.

[Abhijit Dasgupta; Chen Oyan; University of. Get this from a library. Inelastic strain analysis of solder joint in NASA fatigue speciment: final report. [Abhijit Dasgupta; Chen Oyan; United States. Solder fatigue is the mechanical degradation of solder due to deformation under cyclic loading.

This can often occur at stress levels below the yield stress of solder as a result of repeated temperature fluctuations, mechanical vibrations, or mechanical ques to evaluate solder fatigue behavior include finite element analysis and semi-analytical closed form equations.

The effect on the mechanical properties of adding the quaternary element bismuth to the SnAgCu alloy was measured and compared with the mechanical properties of the ternary alloys. The results of this research study provide necessary data for the modeling of solder joint reliability for a range of Sn-Ag-Cu compositions and a baseline.

A Systems Approach to Solder Joint Fatigue in Spacecraft Electronic Packaging R. Ross, Jr. Jet Propulsion Laboratory California Institute of Technology Pasadena, CA Differential expansion induced fatigue resulting from temperature cycling is a leading cause of solder joint failures in spacecraft.

Achieving high reliability flight hardware. The severity of deviations also varied systematically with Ag content in the solder, but major effects were observed for all the alloys.

A systematic analysis was conducted to assess whether scenarios might exist in which the more fatigue-resistant high Cited by: Fatigue Life Prediction of Solder Joints in Electronic Packages with ANSYS® describes the method in great detail starting from the theoretical basis.

The reader is supplied with an add-on software package to ANSYS® that is designed for solder joint fatigue reliability analysis of electronic packages/5(2).

In Table 2, the fourteen solder joint fatigue models are summarized and arranged by instance, fatigue models 1 through 4 (,) are the plastic-strain fatigue models, while fatigue models 8 through 12 (,,) reflect the energy-based fatigue models.‘Applicable packages’ refers to IC packages that the fatigue models have been tested by: Predicting Fatigue of Solder Joints Subjected to High Number of Power Cycles.

Craig Hillman. 1, Nathan Blattau. 1 number of cycles to failure has a power law dependence on the magnitude of the plastic strain, or inelastic deformation, one of the initial concerns regarding solder joint fatigue was the performance of devices subjected to File Size: 1MB.

Solder Joint Fatigue in a Surface Mount Assembly Subjected to Mechanical Loading Ev olution of inelastic strain in the solder joint for dif by the critical solder joint during fatigue. steel at °C (°F) is described. One test specimen was subjected to a time-independent torsional shear strain test his-tory, and surfaces of constant inelastic strain rate (SCISR_) in an axial/torsional stress space were measured at various pre-determined points during the test.

A second specimen was sub. Figure 6: Fit of validation data to initial correlation of solder joint fatigue lives. Figure 5 shows the SRS correlation of fatigue life data from nineteen accelerated tests (Clech, ).

The correlation gives joint characteristic lives scaled for the solder crack area, ajoint / A. Two-dimensional plane-strain finite element models of the FCOB package were employed. Elasto-plastic and creep deformation behavior of solder was simulated under the temperature cycling conditions to obtain the stress and strain results.

The finite element strain results were used in fatigue life prediction by: Since plastic strain is a dominant parameter that influences low-cycle fatigue, it was used as a basis for evaluation of solder joint structural integrity. The paper discusses the analysis methodologies as implemented in the ANSYS finite element simulation software tool and the corresponding results for the solder joint fatigue life.

Solder Joint Fatigue Study Under Low Temperature Martian Conditions Carissa D. Tudryn California Institute of Technology, Jet Propulsion Laboratory Oak Grove Drive Pasadena, CA @ Abstract—1,2 Electronics, without requiring heater power or.

NASA Technical Memorandum Experimental and Analytical Analysis of Stress-Strain Behavior in a [90°/0°]2s, SiC/Ti Laminate Bradley A. Lerch and Matthew E.

Melis National Aeronautics and Space Administration Lewis Research Center Cleveland, Ohio and Mike Tong Sverdrup Technology, Inc. Lewis Research Center Group Brook Park, Ohio. NASA Lead-Free Solder Body of Knowledge Appendices • Although the solder fillets appeared to be generally good, the solder joint appeared grainier than those formed by Sn63/Pb37 solder.

analysis is included to determine the capability of this proposed Size: 2MB. A State-of-the-Art Review of Fatigue Life Prediction Models for Solder Joint and the damage effect in each finite element will be proportional to the element's geometrical contribution to the solder joint.

The inelastic shear strain range and total inelastic strain energy calculated Low Cycle Fatigue Analysis of Temperature and Cited by: 5. solder joint highly depends on the degree of accurate modeling of the stress and strain related to the strength of the solder joint.

The main cause of failure in solder joints is considered to be thermo-mechanical stresses, caused by differences in the coefficient of thermal expansion (CTE) between the chip and the substrate.

Although there exist promising ways to avoid inelastic strains in solder joints of the second level interconnections in IC package designs, it still appears more typical than not that the peripheral joints of a package/PCB assembly experience inelastic strains.

This takes place at low temperature conditions, when the deviation from the high fabrication temperature is the largest Cited by: 6. solder joint, first, the fatigue life of the solder is verified by a heat cycle test; second, the fatigue life curve is plot-ted based on the correlation between inelastic amplitude ⊿εwhich is the sum of plastic strain and creep strain gained from the simulation; thirdly, the part to be mount-File Size: KB.

This method is applied to cyclic tension-compression loadings using a Sn–Ag–Cu lead-free solder for several loading conditions. The method can separate between the time-independent plastic strain and the time-dependent creep strain in cyclic inelastic deformation of solder by: 5.

Ag leaching into solder and long-term solder joint fatigue are two major mechanisms that cause solder joint failures in c-Si solar cell [44]. Metals such as Ag and Cu are easily dissolved into solder. The dissolution speeds of Ag and Cu, when immersed to PbSn solder, are 10 and μm/s at °C [45].

Fatigue Life Prediction of Solder Joints in Electronic Packages with ANSYS® describes the method in great detail starting from the theoretical basis. The reader is supplied with an add-on software package to ANSYS® that is designed for solder joint fatigue reliability analysis of electronic packages.

Specific steps of the analysis method are discussed through examples. Ansys, Electronics, Electrothermal Analysis, Fatigue Analysis, Fracture Analysis. Solder joint reliability is often a pain point in the design of an electronic system. A wide variety of factors affect solder joint reliability and any one of them can drastically reduce joint lifetime.

Properly identifying and mitigating potential causes of. Solder Joint Reliability Assessment; (such as the accumulated inelastic strain, ε in,acc and inelastic work density per load cycle, W in,acc) and measured fatigue lives of identical.

joint suffers damage over time. This accumulated stress/strain leads to solder fatigue. Solder fatigue leads to delamination and cracks in the solder, which in turn increases the resistance of the IGBT chip, raises the junction temperature, and accelerates the File Size: KB.

Solder fatigue is one of the major product reliability concerns in electric packaging design. In this paper, the application of a mesh-insensitive structural stress method, previously developed by the authors, is demonstrated for characterizing fatigue of solder joints under thermal fatigue and mechanical fatigue conditions.

Three sets of experimental data from literature are analyzed to Cited by: 1. shear strain; they are virtually zero at the center of the solder joint where the maximum shear strain occurs. Fabrication of Solder Joint with a Single Grain A manual soldering procedure [1, 2] was used to fabricate SAC solder joints in the frame.

Soldering areas on the copper were ground flat using grit sandpapers, and sub. Fatigue Life Prediction of Solder Joints in Electronic Packages with ANSYS® describes the method in great detail starting from the theoretical basis.

The reader is supplied with an add-on software package to ANSYS® that is designed for solder joint fatigue reliability analysis of electronic packages. solder balls, and the circuit board to which the FBGA is mounted, can induce substantial stress in the solder joint in thermal cycling. The accumulated inelastic strain may cause fatigue failures in the solder joint after a limited number of thermal cycles.

The observed failure modes for FBGA are. Solder Joint Fatigue. Solder joint fatigue (due to thermal cycling) of electronics devices is one of the main failure modes of electronics systems. It has resulted in serious failure and costly recalls of electronics devices.

This has lead to most large organizations to have dedicated teams of engineers running simulations to prevent solder. Mechanical testing of bulk solder specimens was compared to solder joint arrays for the case of lead free alloys.

The bulk specimen data was taken from the literature. Solder joint array data was X to X higher strength than bulk specimen data. Both bulk reflowed and solder joint reflowed samples showed a 20% decrease in strength with aging. This book presents a systematic approach in performing reliability assessment of solder joints using Finite Element (FE) simulation.

Essential requirements for FE modelling of an electronic package or a single reflowed solder joint subjected to reliability test conditions are elaborated. AFWAL-TR-8 q AD-A PRFDICTTON OF SOLDFR JOINT FATIGUF LIFE H.D. Solomon V. Brzozowski The strains were determined from a finite element analysis of solder joints [12).

The fatigue life -strain correlation was made from isothermal tests on The analysis is complicated by the fact that the actual strain distribution in a solder File Size: 1MB.

Flexural test cases were performed at temperatuand degC. Results were compared with those of temperature cycling (Reference case), in terms of the rate of inelastic strain accumulation, stress-strain hysteresis loops and the predicted fatigue lives of solder joints.

The objective of this research study is to evaluate the solder joint reliability with an approach that encompasses a comprehensive set of degradation behaviors that lead to fatigue failure of the solder joints under various thermal stress conditions.

Exposure to thermal stresses both static and dynamic leads to induction of stresses in the solder. joints as known as thermal fatigue. A finite element analysis using ANSYS APDL was used to predict the fatigue life of the most critical solder joint under thermal cycle loading.

The is the plastic (inelastic) strain range and K and n are the model Size: KB. Solder joint analysis is an important factor in determining the reliability of electronic assemblies.

Solder joint defects can contribute to thermal, mechanical and electrical variations in devices and assemblies. SEM Lab, Inc. has extensive experience in solder joint metallurgical, quality and reliability analysis. Damage accumulation in isothermal cycling is shown to scale with the accumulated inelastic work even in complex cycling scenarios, so that the life of a solder joint ends upon accumulation of a given amount of work.

Individual ball grid array solder joints were cycled in shear fatigue experiments with different load amplitudes and strain by: Mechanical Strength of Selected Soldered Joints and Bulk Solder Alloys cycling, can lead to fatigue failure of the joint. For the majority of soldering oper mm JOINTS d mm t 25mm BULK SOLDER such that the solder in the joint is sub­ File Size: KB.Strength and Lifetime Analysis of SMT Solder Joints: An Exemplary Study of the MiniMELF Component J.

Jendrny, W.H. Müller, Universität-Gesamthochschule Paderborn, and H.-J. Albrecht, Siemens AG, ZT ME 7, Berlin ABSTRACT The reliability and lifetime of SMT solder joints obtained by reflow or wave soldering are investigated for the case.