Evaluation of the Puck Failure Theory for Fiber

Evaluation of the Puck Failure Theory for Fiber Reinforced Composites Student Name 20 April 2009 ME 7501

Introduction l Failure Theories l Compressive Transverse Stress l Shear Stress

Objective l Evaluate the relative performance of Puck’s Failure theory with more traditional theories l Consider udfrc subjected to Transverse and Shear Loading

Failure Theories l Limit – l Interaction – – l Max Stress/Strain Tsai-Wu Hill-Tsai Separate Mode – – Hashin-Rotem Puck

Puck Failure Theory l Separate Mode l Based on Coulomb-Mohr theory for the failure of brittle materials – ‘The stresses on the fracture plane are decisive for fracture’ -Otto Mohr l 2 modes of failure – – l Fiber Inter-Fiber Location of fracture

Puck Failure Theory: Inter-Fiber Failure

Puck Failure Theory: Inter-Fiber Failure

Puck Failure Theory: Master Fracture Body

Puck Failure Theory: AS 4/55 A

Puck Failure Theory: AS 4/55 A

Puck Failure Theory: AS 4/55 A

Puck Failure Theory: AS 4/55 A

Conclusions l l Good performance leading up to and immediately after maximum shear stress point Good transitional performance between tensile and compressive transverse stress Poor performance near maximum compressive stress Requires test data for optimal performance

References l l l Sun, C. T. , Quinn, B. J. , Tao, J. , and Oplinger, D. W. , “Comparative Evaluation of Failure Analysis Methods for Composite Laminates”, DOT/FAA/AR-95/109, May 1996. Puck, A. and Schürmann, H. , “Failure analysis of FRP laminates by means of physically based phenomenological models”, Comp. Sci. and Techn. 58 (1998) 1045 -1067. Lutz, G. , “Fibrous Composite Failure Criteria - Fact and Fantasy. ” CDCM 2006 - Conference on Damage in Composite Materials 2006, Stuttgart, Germany, September 18 -19, 2006.

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