• Full-field deformation response of density-graded foams is investigated by DIC. Effects density gradient are in-situ strain/stress measurements. Mechanisms associated with formation and propagation stress wave discussed. Double shock mechanism observed for graded negative gradients. Positive gradients show a unidirectional (single) compaction wave. Digital image correlation utilized to charac...

In quasi-static tests, flexible polyurethane foam undergoing large compressive loading and unloading deformation exhibits highly nonlinear and viscoelastic behavior. In particular, the response in the first cycle is significantly different from the response in subsequent cycles. In addition, the stresses in the loading paths are higher than those in unloading paths. It is assumed that this quas...

Numerical modeling was carried out to investigate the responses of suction bucket foundations under vertical cyclic loading. Numerical results were compared with centrifuge experiment results. Before the capacity of the model suction bucket to resist cyclic loading could be investigated, the static pullout capacities had to be determined. The buckets with different aspect ratio are investigated...

Triply periodic minimal surfaces (TPMS) have attracted tremendous research interest due to their lightweight and superior mechanical properties. In this study, two TPMS sheet-based structures (FRD Neovius) are designed, fabricated, tested under dynamic quasistatic loading conditions. Selective laser melting (SLM) is employed facilitate the fabrication of such complex out stainless steel (SS316L...

The better the seismic performance of building joints, more lives and property can be preserved in earthquake disasters. This paper briefly introduced the basic structure self-centering reinforced concrete (RC) column-steel beam joints then prepared three types joint specimens. Specimen 1 was a self-centering RC column-steel joint, specimen 2 obtained by removing dampin...

abstract: in this paper, the results of experimental and numerical simulation of low velocity impact process have been carried out to investigate energy absorption of composite sandwich panels with 3d woven fabrics of glass fibers and epoxy resin. for this purpose, diagrams of force-displacement of the quasi-static and quasi-dynamic impact tests were studied. for the finite element simulation, ...

Excessive axial tension is very likely involved in the aetiology of tendon lesions, and the most appropriate indicator of tendon stress state is the true stress, the ratio of instantaneous load to instantaneous cross-sectional area (CSA). Difficulties to measure tendon CSA during tension often led to approximate true stress by assuming that CSA is constant during loading (i.e. by the engineerin...