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Based on the split Hopkinson tensile bar (SHTP) test method, the fracture behavior of the 2A12-T4 aluminum alloy compact tensile (CT) specimens has been investigated using experimental-simulation combination method in this paper. Upon validating the numerical approach by comparing with experimental results, the influence of specimen thickness has been analyzed. It is found that the J-integral curves are increasing exponentially with time, and specimens of different thickness have similar variation laws. With the increase of thickness, the dominant factor changes from plane stress area to plane strain area, and the J-integral value first increases and then decreases to a constant value at last. The percentage of plane strain area in the total thickness has been derived. [ABSTRACT FROM AUTHOR]

This paper takes the compact tensile specimens manufactured by glass fiber reinforced composites as the research object. Hopkinson tension bar experimental technique was used to study the dynamic fracture toughness. The dynamic fracture toughness of [0/90]n laminated and [45/− 45]n laminated compact tensile specimens was measured by Hopkinson tension bar experimental device; the simulation calculation under the same stress wave loading was carried out by ABAQUS, and the accuracy was verified by comparing with the experimental results; using the verified simulation model, the effect of specimen thickness and crack length on the dynamic fracture toughness of fiber reinforced composites was studied. [ABSTRACT FROM AUTHOR]

Because of its path-independence, the J-integral proposed by Rice is widely applied in fracture mechanics. In this paper, the static and dynamic J-integrals under mixed-mode loads of mode I and mode II are investigated on arbitrary integration paths surrounding the crack tip. The J 1 integral is path- independent,but the J 2 integral relies on the coordinate of the beginning and the end of the path. For paths that begins and ends at equidistant points from crack tip on different crack surfaces, the value of J-integrals are equal. Numerical analysis based on equivalent integration area method are carried out. The maximum deviation of solution on different paths are less than 1.23%, and the path-dependence of J-integrals is proved.This work may be helpful in fracture toughness tests of materials. [ABSTRACT FROM AUTHOR]