Finite element analysis on stress/strain in CBGA solder joint with different substrates under thermal cycle

The feasibility of forging of AL-1050 alloy of cylindrical heatsink under warm conditions is demonstrated in the present work. The stress-strain curves and friction factor play an important role in the cylindrical heatsink forging. The purpose of forging lubrication is to reduce friction between blank and die, and to decrease resistance of metal flow to die. The stress-strain curves at different temperatures are obtained by compressing tests. The friction factor between 1050 aluminum alloy and die material are determined at different temperatures by ring compression tests with graphite lubricants. The compressing and ring compressing tests are carried out by using the computerized screw universal testing machine. The finite element method is used to investigate the forming characters of the forging process. To verify the prediction of FEM simulation in the cylindrical heatsink forging process, the experimental parameters such as stress-strain curves and fiction factor, are as the input data during analysis. Maximum forging load and effective stress distribution are determined of the heatsink forging, using the finite element analysis. Finally, the cylindrical heatsink parts are formed by the forging machine under the conditions using finite element analysis.

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Finite element analysis of stress–strain localization and distribution in Al-4.5Cu-2Mg alloy

Transactions of Nonferrous Metals Society of China ◽

10.1016/s1003-6326(18)64758-2 ◽

2018 ◽

Vol 28 (6) ◽

pp. 1200-1215 ◽

Cited By ~ 5

Author(s):

Rahul BHANDARI ◽

Prosanta BISWAS ◽

Manas Kumar MONDAL ◽

Durbadal MANDAL

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Strain Localization ◽

Stress Strain ◽

Element Analysis

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Estimation of transverse tensile behavior of Zircaloy pressure tubes using ring-tensile test and finite element analysis

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1177/0954406212460474 ◽

2012 ◽

Vol 227 (6) ◽

pp. 1177-1186 ◽

Cited By ~ 9

Author(s):

MK Samal ◽

KS Balakrishnan ◽

J Parashar ◽

GP Tiwari ◽

S Anantharaman

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Tensile Tests ◽

Tensile Specimen ◽

Displacement Curve ◽

Stress Strain ◽

Element Analysis ◽

Transverse Tensile ◽

Pressure Tubes ◽

Load Displacement

Determination of transverse mechanical properties from the ring type of specimens directly machined from the nuclear reactor pressure tubes is not straightforward. It is due to the presence of combined membrane as well as bending stresses arising in the loaded condition because of the curvature of the specimen. These tubes are manufactured through a complicated process of pilgering and heat treatment and hence, the transverse properties need to be determined in the as-manufactured condition. It may not also be possible to machine small miniaturized specimen in the circumferential direction especially in the irradiated condition. In this work, we have performed ring-tensile tests on the un-irradiated ring tensile specimen using two split semi-cylindrical mandrels as the loading device. A three-dimensional finite element analysis was performed in order to determine the material true stress–strain curve by comparing experimental load–displacement data with those predicted by finite element analysis. In order to validate the methodology, miniaturized tensile specimens were machined from these tubes and tested. It was observed that the stress–strain data as obtained from ring tensile specimen could describe the load–displacement curve of the miniaturized flat tensile specimen very well. However, it was noted that the engineering stress–strain as directly obtained from the experimental load–displacement curves of the ring tensile tests were very different from that of the miniaturized specimen. This important aspect has been resolved in this work through the use of an innovative type of 3-piece loading mandrel.

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Solder joint strain reduction of leadless IC packages through finite element analysis tailored PCB construction

10.1109/iemts.1989.76118 ◽

2003 ◽

Cited By ~ 1

Author(s):

K.R. Thompson

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Solder Joint ◽

Element Analysis

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Mathematical Simulation of Cramped Bending of Sheet Parts Using Finite Element Analysis

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.685.186 ◽

2016 ◽

Vol 685 ◽

pp. 186-190 ◽

Cited By ~ 1

Author(s):

Е.V. Eskina ◽

E.G. Gromova

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Mathematical Simulation ◽

Process Parameters ◽

Strain State ◽

Basic Process ◽

Ansys Software ◽

Stress Strain ◽

Element Analysis ◽

Stress Strain State

The paper describes the method of manufacture of profiles in cramped bending conditions using polyurethaneThe scope of studies included stress-strain state of elastic die and parent sheet, as well as the influence of the basic process parameters on characteristics of the produced items using ANSYS software.

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Parametric Variational Principle for Bi-Modulus Materials and Its Application to Nacreous Bio-Composites

International Journal of Applied Mechanics ◽

10.1142/s1758825116500824 ◽

2016 ◽

Vol 08 (06) ◽

pp. 1650082 ◽

Cited By ~ 3

Author(s):

Liang Zhang ◽

Huiting Zhang ◽

Jian Wu ◽

Bo Yan ◽

Mengkai Lu

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Variational Principle ◽

Principal Stress ◽

Stress Strain ◽

Element Analysis ◽

Parametric Variational Principle ◽

Strain Relation ◽

Stress Strain Relation ◽

Nonlinear Stress

Bi-modulus materials have different moduli in tension and compression and the stress–strain relation depends on principal stress that is unknown before displacement is determined. Establishment of variational principle is important for mechanical analysis of materials. First, parametric variational principle (PVP) is proposed for static analysis of bi-modulus materials and structures. A parametric variable indicating state of principal stress is included in the potential energy formulation and the nonlinear stress–strain relation is evolved into a linear complementarity constraint. Convergence of finite element analysis is thus improved. Then the proposed variational principle is extended to a dynamic problem and the dynamic equation can be derived based on Hamilton’s principle. Finite element analysis of nacreous bio-composites is performed, in which a unilateral contact behavior between two hard mineral bricks is modeled using the bi-modulus stress–strain relation. Effective modulus of composites can be determined numerically and stress mechanism of “tension–shear chain” in nacre is revealed. A delayed effect on stress propagation is found around the “gaps” between mineral bricks, when a tension force is loaded to nacreous bio-composites dynamically.

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