Failure analysis of composite laminates subjected to hydrostatic stresses: A multicontinuum approach

2012

As a part of the Second World-Wide Failure Exercise, the originators (or their collaborators) of three-dimensional failure theories applied their methods to 12 carefully selected challenging problems (test cases). In this article, the 'blind' theoretical predictions from 12 failure theories, making the backbone of Part (A) of the Second World-Wide Failure Exercise, are compiled in a structured manner. Key features in each theory are identified including: types of failure models employed, whether linear or nonlinear analysis was carried out, reliance on software and numerical methods, allowance for thermal stresses and identification of modes of failure. The results (failure envelopes and stress-strain curves) have been superimposed to show similarities and differences between the predictions of the various theories. In addition, bar charts have been constructed to demonstrate the levels of agreement between the predicted failure stresses and strains. Sources of differences between the predictions of the various three-dimensional failure theories are discussed. Further publications are planned in Part B in which comparison will be made between the predictions described here and the experimental results.

Section: Identification Of the Theoriesmentioning

confidence: 99%

Benchmarking of triaxial failure criteria for composite laminates: Comparison between models of ‘Part (A)’ of ‘WWFE-II’

2012

“…Details of 12 models used and their predictions are published in various associated references. [3][4][5][6][7][8][9][10][11][12][13][14] A comparison between all of these predictions is made in Kaddour and Hinton. 15 …”

Section: Introductionmentioning

confidence: 99%

Input data for test cases used in benchmarking triaxial failure theories of composites

2012

175

152

This article gives details of the input data provided for use in the Second World-Wide Failure Exercise (WWFE-II) for benchmarking triaxial failure criteria. It includes (a) three-dimensional elastic constants, ultimate strains and strengths and the nonlinear stress-strain curves for five unidirectional laminae and their constituents and (b) a description of 12 challenging test cases of 5 composite laminates, the lay-ups, layer thicknesses, stacking sequences and the loading conditions. The originators of 3D failure theories were requested to use the exact data provided here in their blind predictions of the test cases. The instructions issued to the contributors are also presented at the end of this article.

“…8 The criterion, known as micro-mechanics of failure (MMF), described by Ha, deviated from the original suggested by Tsai in many aspects, including (a) the elimination 2 Carrere, Laurin and Maire 9 ONERA (France) 3 Cuntze Retired Engineer (Germany) 4 Ha, Jin and Huang 14 Hanyang University (S Korea) 5 Nelson, Hansen, Mayes 5 Firehole Technologies, Wyoming University, Alfred University (USA) 6 Zhou and Huang 11 Tongji University (China) 7 Kress ETZ Zurich (Switzerland) 8 Pinho, Darvizeh, Robinson, Schuecker, Camanho 8 Imperial College (UK), University of Porto (Portugal) 9 Deuschle and Krö plin 6 ISD, Stuttgart University (Germany) 10 Rotem 13 Technion University (Israel) 11 Wolfe, Butalia, Zand and Schoeppner 10 Ohio State University, AFRL, Wright-Patterson, AFB, Ohio (USA) 12 Ye and Zhang 7 Leeds University and Manchester University (UK) of the enhancement in the biaxial compressive strength predicted by the original Tsai-Wu's theory (b) employment of finite element analysis to carry out the micromechanical analysis and (c) introduction of physically based criteria for fibre failure, matrix failure and interface failure. At the end, Tsai together with a group from South Korea, led by Sung Ha, have provided a valuable contribution to WWFE-II.…”

Section: Hinton and Kaddour 2287mentioning

confidence: 99%

“…The model uses a finite element analysis to predict failure on a microscopic level (matrix and fibres). They introduced new modifications to the model in order to increase its ability to predict the behaviour under 3D stresses 9. …”

mentioning

confidence: 99%

The background to the Second World-Wide Failure Exercise

Smith

et al. 2012

In 2004, the authors completed the First World-Wide Failure Exercise dealing with benchmarking recognised failure criteria under two-dimensional, in-plane loadings. Based on the success and the lessons learnt, and using the same strategy, the authors have organised the 'Second World-Wide Failure Exercise'. It aims at filling key gaps identified and establishing the status of 12 theoretical methods for predicting failure in fibre-reinforced composite materials subjected to three-dimensional or (triaxial) states of stress. This paper gives an account of the background to the Second WorldWide Failure Exercise, the process of completing the first part (Part A) and a summary of key conclusions.