We study the buckling of thin elastic plates caused by residual strains concentrated near a free edge. This is a model for plant leaves and torn plastic sheet morphologies. We derive new governing equations explaining self-similar patterns reported earlier in experiments. We reveal the cascade mechanism, determine the bounds for its wavelengths, and predict a similarity factor of 3 in agreement...

A method of measuring biaxial stress-strain curves for sheet metal samples subjected to large plastic strains is described for one example aluminum alloy (AA 5754-O). The method uses a portable X-ray diffraction (XRD) system to measure in situ stresses during tensile deformations. Calibration of X-ray elastic constants and the effects of texture and intergranular stresses are discussed. Uniaxia...

Three-dimensional deformation field in the vicinity of a blunt crack in a sheet of low-hardening material is determined using laser speckle and moir6 techniques. Experimental results are compared with the HRR singularity field. A zone of dominant three-dimensional effects is mapped out ahead of the crack tip. Strain contours, elastic plastic boundary and maximum shear strain trajectories are al...

The press formability of a dual-phase stainless steel sheet consisting of ferrite and austenite phases was estimated from a viewpoint of texture using plastic strain ratios (r-values). From the comparison of the mechanically obtained r-values by tensile test and the r-values calculated from the crystal orientation distribution functions (ODFs) of each phase, we found the ferrite phase contribut...