scholarly journals Crack Initiation and Extension under Penetration of Thin Metal Sheet.

1991 ◽  
Vol 57 (539) ◽  
pp. 1495-1501
Author(s):  
Ken KAMINISHI ◽  
Motoharu TANEDA ◽  
Shunichi KAWANO ◽  
Shinji TANAKA
Keyword(s):  
Crack Initiation ◽  
Metal Sheet ◽  
Thin Metal ◽  
Thin Metal Sheet

Numerical Procedure for Identification of Constitutive Equations Based on Experimental Data

2013 ◽  
Vol 43 (3) ◽  
pp. 43-50 ◽  
Author(s):  
Anguel Baltov ◽  
Ana Yanakieva
Keyword(s):  
Experimental Data ◽  
Experimental Evidence ◽  
Constitutive Equations ◽  
Constitutive Relations ◽  
Numerical Procedure ◽  
Small Time ◽  
Metal Sheet ◽  
Thin Metal ◽  
Stress Strain ◽  
Thin Metal Sheet

Abstract In this research experimental data obtained by well-known methods of displacement measurement are considered, whereas a thin cell meshwork has been fixed to the surface of the observed loaded object (thin metal sheet, for instance) and a set of point displacements has been ob- tained. Based on such experimental evidence, an eight point numerical procedure is proposed in the paper to identify the constitutive relations for small time increments. The presented approach is also applicable in case of micro deformations and facilitates the derivation of nonlinear constitutive equations in stress/strain increments. Approximate error es- timation of the procedure is additionally performed, and a test example is given.

2723 Slide-bending Formation of Thin Metal Sheet by Using Force Control

2007 ◽  
Vol 2007.1 (0) ◽  
pp. 607-608
Author(s):  
Hiroshi HARADA ◽  
Yuhei SAKAMOTO ◽  
Ya Zhuo SUN ◽  
Yasuo MARUMO ◽  
Liqun RUAN
Keyword(s):  
Force Control ◽  
Metal Sheet ◽  
Thin Metal ◽  
Thin Metal Sheet

scholarly journals Crack Propagation in Thin Metal Sheet Under Repeated Loading

1961 ◽  
Vol 83 (1) ◽  
pp. 23-31 ◽  
Author(s):  
H. W. Liu
Keyword(s):  
Crack Propagation ◽  
Axial Loading ◽  
Analytical Investigation ◽  
Metal Sheet ◽  
Thin Metal ◽  
Repeated Loading ◽  
Finite Width ◽  
Mean Stress ◽  
Thin Metal Sheet ◽  
Stress Dependent

An experimental and analytical investigation was undertaken to study the fundamental factors of crack propagation in a thin metal sheet under repeated axial loading. Sheet specimens of 2024-T3 aluminum alloy containing a central hole were used in the experimental investigation. Stress range and mean stress were the controlled parameters. An expression for crack length was derived, based on the concept of geometric similarity of crack configuration, for a semi-infinite sheet subjected to repeated loads consisting of a constant stress and mean stress. The expression is in terms of a stress dependent propagation factor and an exponential function of the number of cycles of loading. The expression for a semi-infinite sheet was modified for crack propagation in a specimen of finite width. Accurate predictions of the propagation life was possible using the modified equation. Photomicrographic observations of the crack tips were made.

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