Component Failure Analysis in MEMS Packaging

2002 ◽  
Author(s):  
J. Zou ◽  
M. Waelti ◽  
A. Bowman ◽  
J. Marchetti ◽  
C. H. Mastrangelo
Keyword(s):  
Failure Modes ◽  
Failure Criteria ◽  
Micro Electro Mechanical System ◽  
Element Analysis ◽  
Identification Methods ◽  
Mems Packaging ◽  
Potential Failure ◽  
Von Mises ◽  
Scale Failure ◽  
Improve Reliability

A finite element analysis (FEA) method used to determine the limits of package failure criteria is described. The failure criteria for the micro-electro-mechanical system (MEMS) packages presented here include von Mises, Mohr’s theory, and micro-crack phenomena. In addition, we explore the limits of micro-scale failure criteria on brittle MEMS assemblies. The paper describes stress source identification methods and failure mechanisms for packaged assemblies that can guide MEMS package designers to reduce potential failure modes and improve reliability.

Finite Element Analysis of X-Cor Sandwich's Compressive Strength

2011 ◽  
Vol 306-307 ◽  
pp. 733-737
Author(s):  
Xu Dan Dang ◽  
Xin Li Wang ◽  
Hong Song Zhang ◽  
Jun Xiao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Compressive Strength ◽  
Failure Modes ◽  
Failure Mechanisms ◽  
Element Model ◽  
Failure Criteria ◽  
Stiffness Degradation ◽  
Element Analysis ◽  
Finite Element Software

In this article the finite element software was used to analyse the values for compressive strength of X-cor sandwich. During the analysis, the failure criteria and materials stiffness degradation rules of failure mechanisms were proposed. The failure processes and failure modes were also clarified. In the finite element model we used the distributions of failure elements to simulate the failure processes. Meanwhile the failure mechanisms of X-cor sandwich were explained. The finite element analysis indicates that the resin regions of Z-pin tips fail firstly and the Z-pins fail secondly. The dominant failure mode is the Z-pin elastic buckling and the propagation paths of failure elements are dispersive. Through contrast the finite element values and test results are consistent well and the error range is -7.6%~9.5%. Therefore the failure criteria and stiffness degradation rules are reasonable and the model can be used to predict the compressive strength of X-cor sandwich.

Response, Localization, and Rupture of Anisotropic Tubes Under Combined Pressure and Tension

2020 ◽  
Vol 88 (1) ◽  
Author(s):  
Martin Scales ◽  
Kelin Chen ◽  
Stelios Kyriakides
Keyword(s):  
Constitutive Model ◽  
Ductile Failure ◽  
Failure Criteria ◽  
Yield Function ◽  
Local Deformation ◽  
Al Alloys ◽  
Biaxial Stress ◽  
Image Correlation ◽  
Element Analysis ◽  
Von Mises

Abstract The inelastic response and failure of Al-6061-T6 tubes under combined internal pressure and tension is investigated as part of a broader study of ductile failure of Al-alloys. A custom experimental setup is used to load thin-walled tubes to failure under radial paths in the axial-hoop stress space. All loading paths achieve nominal stress maxima beyond which deformation localizes into a narrow band. 3D digital image correlation (DIC) was used to monitor the deformations in the test section and successfully captured the rapid growth of strain within the localization bands where they burst. The biaxial stress states generated are first used to calibrate the nonquadratic anisotropic Yld04-3D yield function (Barlat et al., 2005, “Linear Transformation-based Anisotropic Yield Functions,” Int. J. Plasticity, 21(5), pp. 1009–1039). The constitutive model is then incorporated through a UMAT into a finite element analysis and used to simulate numerically the experiments. The same calculations were performed using von Mises (VM) and an isotropic nonquadratic yield function. The material hardening responses adopted were extracted for each constitutive model from the necked zone of a tensile test using an inverse method. The use of solid elements captures the evolution of local deformation deep into the localizing part of the response, producing strain levels that are required in the application of failure criteria. The results demonstrate that the adoption of a nonquadratic yield function, together with a correct material hardening response are essential for large deformation predictions in localizing zones in Al-alloys. Including the anisotropy in such a constitutive model produces results that are closest to the experiments.

Improving Prediction of Limit Bending Load for Wall-Thinned Pipes by Reconsidering the Effect of Biaxiality

2015 ◽  
Author(s):  
Kosuke Mori ◽  
Toshiyuki Meshii
Keyword(s):  
Finite Element Analysis ◽  
Large Strain ◽  
Axial Stress ◽  
Plastic Instability ◽  
Failure Criteria ◽  
Von Mises Stress ◽  
Element Analysis ◽  
Crack Penetration ◽  
Bending Load ◽  
Von Mises

In this paper, a failure criterion applicable to large-strain finite element analysis (FEA) results was studied to predict the limit bending load Mc of the groove shaped wall-thinned pipes, under combined internal pressure and bending load, that experienced cracking. In our previous studies, Meshii and Ito [1] considered cracking of pipes with groove shaped flaw (small axial length δz in Fig. 1) was due to the plastic instability at the wall-thinned section and proposed the Domain Collapse Criterion (DCC). The DCC predicted Mc of cracking for small δz by comparing the von Mises stress σMises with the true tensile strength σB. However, it was indicated that the predictability of Mc was not necessarily sufficient. Thus, in this work, attempts were made to improve the accuracy of Mc prediction with a perspective that multi-axial stress state might affect this plastic instability. As a result of examination of the various failure criteria based on multi-axial stress, it was confirmed that the limit bending load of the groove flawed pipe that experienced cracking could be predicted within 5 % accuracy by applying Hill’s plastic instability onset criterion [2] to the outer surface of the crack penetration section. The accuracy of the predicted limit bending load was improved from DCC’s error of 15% to 5%.

Progressive failure analysis of fiber-reinforced laminated composites containing a hole

2017 ◽  
Vol 27 (7) ◽  
pp. 963-978 ◽  
Author(s):  
Hadi Bakhshan ◽  
Ali Afrouzian ◽  
Hamed Ahmadi ◽  
Mehrnoosh Taghavimehr
Keyword(s):  
Failure Analysis ◽  
Failure Modes ◽  
Progressive Failure ◽  
Composite Plates ◽  
Failure Criteria ◽  
Element Analysis ◽  
Progressive Failure Analysis ◽  
Numerical Predictions ◽  
Open Hole ◽  
Failure Loads

The present work aims to obtain failure loads for open-hole unidirectional composite plates under tensile loading. For this purpose, a user-defined material model in the finite element analysis package, ABAQUS, was developed to predict the failure load of the open-hole composite laminates using progressive failure analysis. Hashin and modified Yamanda-Sun’s failure criteria with complete and Camanho’s material degradation model are studied. In order to achieve the most accurate predictions, the influence of failure criteria and property degradation rules are investigated and failure loads and failure modes of the composites are compared with the same experimental test results from literature. A good agreement between experimental results and numerical predictions was observed.

Rough Contact Between Elastically and Geometrically Identical Curved Bodies

1982 ◽  
Vol 49 (2) ◽  
pp. 345-352 ◽  
Author(s):  
M. D. Bryant ◽  
L. M. Keer
Keyword(s):  
Maximum Principle ◽  
Brittle Fracture ◽  
Contact Area ◽  
Yield Criterion ◽  
Failure Criteria ◽  
Tensile Stresses ◽  
Potential Failure ◽  
Elliptical Contact ◽  
Normal And Tangential Loads ◽  
Von Mises

Surface and subsurface stresses and displacements are obtained when two geometrically and elastically identical rough bodies are pressed together by normal and tangential loads. The theories of Cattaneo and Mindlin, who introduce zones of slip and stick within an elliptical contact area, are used. Von Mises yield criterion and maximum principle tensile stresses are used as failure criteria to assess potential failure due to shear or brittle fracture.

scholarly journals Finite Element Analysis of Composite Laminated Timber (CLT)

Proceedings ◽  
2018 ◽  
Vol 2 (23) ◽  
pp. 1454
Author(s):  
Juan Enrique Martínez-Martínez ◽  
Mar Alonso-Martínez ◽  
Felipe Pedro Álvarez Rabanal ◽  
Juan José del Coz Díaz
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Failure Modes ◽  
Element Model ◽  
Failure Criteria ◽  
Sustainable Construction ◽  
Homogeneous Material ◽  
Timber Species ◽  
Structural Behaviour ◽  
Element Analysis

In the research for sustainable construction, cross-laminated timber (CLT) has gained popularity and become a widely used engineered timber product. However, there are few numerical studies of the structural behaviour of CLT. Among other issues, the orthotropic properties of CLT complicate finite element analysis (FEA). This paper presents a finite element model (FEM) to predict the structural behaviour of CLT beams subjected to sustained flexural loading. This numerical model includes a material model based on the orthotropic material properties of different timber species. Furthermore, the orientation and the properties of each layer are considered. Most of the previous studies simulate CLT beams as a homogeneous material. However, in this work the CLT beam is modelled as a composite material made up of five layers with different orientations and properties. Bonded contacts are used to define the interaction between layers. In addition, nonlinearities, such as large displacement, are used to simulate the behaviour of CLT beams. The model provides the load-displacement relationship and stress concentration. Tsai-Wu failure criteria is used in the simulation to predict the failure modes of the CLT beams studied.

scholarly journals Finite Element Analysis of Cold Formed Steel Channel Columns with Complex Edge Stiffeners and Web Holes using Abaqus

2019 ◽  
Vol 8 (12S) ◽  
pp. 1039-1044
Keyword(s):  
Failure Modes ◽  
Present Theory ◽  
Direct Examination ◽  
Element Analysis ◽  
Component Type ◽  
Test Component ◽  
Cold Formed Steel ◽  
Von Mises ◽  
Channel Segment ◽  
Numerical Examination

The present theory work means to think about the numerical examination on models of channel segment with middle and complex edge stiffeners and web gaps under pivotal pressure. A wide scope of parameters, for example, slimness proportion, spine width and thickness have been considered in the investigation. An aggregate of 12 channel models with various parameters, for example, length, thickness and rib width are reenacted. The limited component non-direct examination program ABAQUS V6.14-2 is utilized to reproduce the models. The material properties are acquired from Coupon test. Component type utilized in this non-straight examination is SHELL. A Static, Riks step is utilized to complete examination. The Failure modes, extreme burden and the pressure conveyance around web gaps are inquired about. The relocation parts in every augmentation of burden along X, Y and Z bearings and Rotation segment about X course are gathered. The Von-Mises pressure forms, Deformed shapes and disappointment modes including nearby, horizontal distortional and parallel torsional clasping modes are acquired. The pivotal burden limits of pressure individuals with various parameters are looked at.

A Criterion for Plastic Failure of Notched High Strength Steel Structures

1981 ◽  
Vol 103 (2) ◽  
pp. 142-147
Author(s):  
J. Margetson
Keyword(s):  
High Strength Steel ◽  
Ductile Failure ◽  
Steel Structures ◽  
High Strength ◽  
Failure Criteria ◽  
Element Analysis ◽  
Hardening Material ◽  
Stress Maximum ◽  
Stress States ◽  
Von Mises

A criterion of ductile failure for a high strength steel under a multiaxial state of stress is established. A family of multiaxial stress states at failure is generated from the fracture data of a number of notched tensile specimens with differing notch geometries. An elasto-plastic finite element analysis, for a work hardening material, is used to analyze each test. Several failure criteria are considered including maximum stress, maximum strain, and distortional energy. A Von Mises type criterion, suitably equated to the maximum tensile properties of the material, gives highly accurate predictions in all cases.

scholarly journals Failure Mode Transition in Air-Backed Plates from Near Contact Underwater Explosions

2010 ◽  
Vol 17 (6) ◽  
pp. 723-739 ◽  
Author(s):  
Mark J. Riley ◽  
Geoffrey T. Paulgaard ◽  
Julian J. Lee ◽  
Malcolm J. Smith
Keyword(s):  
Failure Mode ◽  
Failure Modes ◽  
Failure Criteria ◽  
Dominant Factor ◽  
Bubble Collapse ◽  
Element Analysis ◽  
Linear Interaction ◽  
Underwater Explosions ◽  
Quadratic Interaction ◽  
Thickness Shear

Recent experiments involving near-contact underwater explosions on air-backed plates suggest the following failure mode categories: (1) holing and petaling, (2) complete or partial edge tearing due to shock only, (3) complete or partial edge tearing due to shock and bubble collapse, and (4) large deformation without rupture. Finite-element analysis was used to further investigate the detailed response and failure of the plates, and determine the limit between center plate holing and edge failure. When compared with experimental results, finite-elements showed good agreement with the failure modes of the plates and reasonable agreement with the experimental deformations. It was found that the linear interaction criteria (LIC) failure between plastic strain and through-thickness shear stress produced results closer to experiments than the quadratic interaction criteria (QIC). For the 18~gauge specimens it was found that the through-thickness shear dominated the failure initiation for very close proximity charges, with the direct strain becoming dominant as the standoff was increased. For the thinner 20 and 22 gauge plates the direct strain was always found to be the dominant factor in the failure criteria.

Non-Linear Finite Element Analysis on Rubber O-Sealing Ring of SRM

2015 ◽  
Vol 1095 ◽  
pp. 490-494
Author(s):  
Jia Zhao Chen ◽  
Min Xiang Huang ◽  
Xue Ren Wang
Keyword(s):  
Compression Ratio ◽  
Three Dimensional ◽  
Residual Deformation ◽  
Failure Criteria ◽  
Von Mises Stress ◽  
Mechanical State ◽  
Element Analysis ◽  
Rubber Ring ◽  
Sealing Ring ◽  
Von Mises

ABAQUS was utilized to establish a three-dimensional simplified model for rubber O-sealing ring and simulate the mechanical state and deformation in working condition. The influence of medium pressures and compression ratios on the mechanical state were analyzed. The results show that both the maximum Von Mises stress and contact pressure of rubber ring increase as the medium pressure or compression ratio increases, so, larger compression ratio, without causing residual deformation, should be chosen. Based on the failure mode of SRM sealing structure, the failure criteria of the maximum contact stress and shear stress of rubber O-sealing ring were studied.

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