The dynamic responses of sandwich panels with homogeneous and stepwise graded aluminium foam cores subjected to impact loadings were investigated via experimentation finite element simulation in this paper. low-velocity tests conducted using a drop-weight facility at four different velocities, the results which compared terms force-displacement response, energy absorption damage status. It was found that density gradient had marked influence on deformation failure behaviour front facesheets....

This paper employed squeeze-casting (SC) technology to develop a novel Al-7Si-1.5Cu-1.2Ni-0.4Mg-0.3Mn-0.15Ti heat-resistant alloy, addressing the issue of low room/high temperature elongation in traditional gravity casting (GC). Initially, effects SC and GC processes on microstructure properties alloy were investigated, followed by an examination evolution samples over thermal exposure time. The results indicate that process significantly improves alloy's microstructure. Compared secondary...

In engineering design, introducing lattice structures offers a cost-effective method for reducing weight while enhancing load-bearing efficiency, compared to merely the material strength of solid component. Among various structure configurations developed thus far, and stiffness these remain significantly below their theoretical limits. This study demonstrates that limits in can be achieved by mimicking solution strengthening mechanism materials science. innovative achieves highest...

Motorcycle to vehicle impact accidents occur frequently in real world and often cause serious brain injuries deaths of motorcyclists. This study aims research the motorcyclist head responses helmet protection performance at common motorcycle-vehicle scenarios. First, multi-body system (MBS) models were developed investigate motorcyclist's conditions (position, orientation velocity) time impacts with vehicle. Then, input finite element (FE) striking obtain tissue level responses, such as coup...

The car front bumper system needs to meet the requirements of both pedestrian safety and low-speed impact which are somewhat contradicting. This study aims design a new kind modular self-adaptive energy absorber can balance two performances. X-shaped energy-absorbing structure was proposed enhance absorption capacity during by changing its deformation mode based on amount external collision energy. Then, finite element simulations with realistic vehicle performed demonstrate crashworthiness...

A common reconstruction procedure after a wide resection of bone tumors around the knee is endoprosthetic replacement. The aim this study was to investigate characteristics injury patient replacement during walking.A subject-specific finite element model femur-prosthesis-tibia complex established via CT scans. To obtain its physiologically realistic loading environments, musculoskeletal inverse dynamic analysis implemented. extracted muscle forces and ground were then applied stress...

Due to the good mechanical performances and design flexibility of Long Glass Fiber Reinforced Polypropyl-ene (LGFRP) composite, it has been increasingly used in automotive components, which LGFRP components are likely sustain different strain rates loading during a crash event. This study aims investigate correlations between rate, will be applied crash-worthiness energy absorbing property analysis bumper beam under longitudinal impact. Firstly, rate dependent material properties determined,...

With the rapid development of car crash sensing and identification technology, application pre-triggering airbag system is becoming an important option to improve vehicle safety. Thus, present study aims investigate injury protection ability optimize its performance in frontal crashes regarding key physical parameters. A driver restraint model established validated by National Crash Analysis Center was employed for studying system. Then, influences triggering time, volume scaling factor,...

A simultaneous shape and stacking sequence optimization algorithm is presented for laminated composite free‐form shells, by which the coupled effect of can be considered. The objective determined as maximizing fundamental natural frequency to obtain largest stiffness shells. Nonuniform rational B‐spline (NURBS) employed represent geometrical shapes. coordinates NURBS control points fiber orientations are set up continuous discrete variables, respectively, optimized simultaneously. To improve...

Non-fatal tibia and ankle injuries without proper protection from the restraint system has gotten wide attention researchers. This study aimed to investigate occupant under realistic frontal impact environment that is rarely considered in previous experimental simulant studies.An integrated occupant-vehicle model was established by coupling an isolated car cab a hybrid with biofidelic pelvis-lower limb model, while its loading conditions were extracted full-frontal test. A parametric...