Experimental and numerical investigations on failures due to plasticity in thin walled structures

International Conference on Recent Advancements and Effectual Researches in Engineering Science and Technology

Jamil, A.^1 ; Khan, A.H.^1 ; Ali, S.^1

Department of Mechanical Engineering, ZHCET, Aligarh Muslim University, Aligarh (U.P.)

202002, India^1

关键词: Circular cross-sections;    Commercial finite element codes;    Geometrical and physical nonlinearities;    Numerical investigations;    Plane strain analysis;    Plasticity model;    Structural behaviour;    Three-dimensional analysis;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/396/1/012065/pdf
DOI  :  10.1088/1757-899X/396/1/012065

来源: IOP

【 摘 要 】

Plasticity is one of the prominent cause of failures in metallic materials and with the continuous efforts of mankind in exploring domains of high uncertainty, a thorough understanding of structural behaviour under extreme conditions is quite necessary. Particularly, in the case of thin walled structures, where geometrical and physical nonlinearities are quite significant and require sophisticated techniques for failsafe design. In this work, a numerical model was developed in the commercial finite element code of ABAQUS®, after experimentation of 6150 cold rolled steel used in thin walled pressure vessels. For this, proper experimentation quest was carried out based on the ASTM E8/E8M standard and dog-bone specimen were made with both planar and circular cross-sections. Ramberg-Osgood plasticity equation was employed for the smoothening of the test data along with the extrapolation of stresses at higher strain level. A tabular plasticity model was thereby made from the smoothened and extrapolated stress-strain experimental data, and implemented in the material definition module of ABAQUS®. Both plane stress CPS4R and plane strain CPE4R elements were employed in planar dog-bone specimen and C3D8R elements were used for three dimensional planar and circular dog-bone specimen. The results from the simulation were in excellent agreement with the experimental data with the plane stress analysis slightly underestimating, the plane strain analysis slightly overestimating the load and the three dimensional analysis lying in between the two.