The inhomogeneous temperature field and large temperature gradient in the laser cladding process form thermal stress and thermal deformation, which lead to residual stress. In this paper, numerical simulations are developed to investigate the temperature and stress distributions of the cladding model as well as the longitudinal residual stress on the specific paths under different scanning modes. The results indicate that most of the stress is concentrated in the cladding layer and its bonding region with the substrate. Furthermore, the longitudinal residual stress is the largest along the scanning path direction.
The single yarn pullout test is critical for the energy dissipation mechanism research of aramid fabric. This paper conducted both traditional in-plane and out-of-plane tests. The in-plane test utilized digital image correlation (DIC) technique to measure the displacement filed during the pullout process and analyzed the behavior of fabric shear deformation. Three different transverse pre-tension force variables were set for both tests to research the effect of pre-tension force on the pullout load. Comparing the two sets of tests, the results showed that pullout load and fabric energy consumption increased with increasing pre-tension force and the load of out-of-plane pullout was greater under the same experimental conditions. Finally, an explanation was provided for the latter phenomenon.
Carbon fiber electrodes can simultaneously realize energy storage and load-carrying. In this study, a 3D-RVE multiphysics model of carbon fiber electrode is established to simulate the lithiation process under different discharge multiplicities. Results show that lowering the discharge multiplicity and elevating the fiber spacing can promote the uniformity of lithium concentration, stress distribution and volume expansion. The hydrostatic pressure has a facilitating effect on the discharge process, which proves the two-way coupling effect of the model. This work may contribute to understand the lithiation mechanism of carbon fiber electrode and provide ideas for multi-physics field modeling of structural batteries.
Fiber metal laminates (FMLs) are a type of thin-layer composite structure formed by curing metal alloys and composite materials at a certain temperature and pressure. This paper adopts surface machining to create a grid-like structure on metal plates and manufactures glass fiber metal laminates using the treated metal plates and prepreg. The laminates are then subjected to three types of mechanical performance tests: tension, compression, and three-point bending, analyzing the failure modes of the specimens under different conditions. The experimental results show that compared to laminates without surface-designed metal plates, specimens with grid-like metal surface design exhibit a 9.1% increase in tensile strength, an 8.1% increase in tensile failure displacement, a 25.5% increase in compression strength, a 54.46% increase in compression failure displacement, a 7.1% increase in bending strength, and a 34.67% increase in bending failure displacement. This study demonstrates that surface grid-like treatment of metal can enhance the mechanical properties of fiber metal laminates.
In this paper, the influence of geometrical parameters on the compressive bearing capacity of the new repairable adaptive resin based carbon fibre composite single stiffener plate is analyzed by numerical simulation. The interface debonding and the progressive material damage are considered in the finite element model. For a single stiffener plate with a given layup sequence and basic dimensions, the structural optimization design can be carried out within a certain range. Due to the mismatch between the stiffness of the stiffener and skin, interface stress will increase, leading to early failure caused by interface damage. Considering and not considering interface failure will obtain different optimization results. The reasonable design of a single stiffener plate will directly affect the corresponding multi stiffened plate design.
This study employs ABAQUS/Explicit to simulate the mechanical behavior of composite honeycomb sandwich panels under flat crush and lateral compression, considering both unfilled and filled structures. Utilizing the Johnson-Cook model for aluminum alloy and a crushable foam model for the filled matrix, predicting damage evolution with Hashin criteria and a cohesive zone model. The impact of reinforcement methods, including short carbon fibers and silicon dioxide particles at 1% content, on the compression strength and energy absorption of infused panels is analyzed. Results show that these reinforcement methods significantly improve the structural performance of composite honeycomb sandwich panels, particularly their compression strength and energy absorption capabilities. offering an effective enhancement strategy. However, additional studies are needed to optimize content and interaction mechanisms between reinforcements and foam matrix is recommended.
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