Numerical Modeling of the Hot Forming Process of Composite Materials

Abstract

We present a fully coupled thermomechanical simulation of the hot forming process of composite materials. The raw material is a mixture of resin powders, strengthening particles and reinforcing fibers. Complex material responses in the process, such as phase change (melting and polymerization) and reorientation of the fibers, determine the microstructure and the performance of the final product. A phase-aware incremental mesh-free Lagrangian method is presented to overcome the challenges, which combines the Optimal Transportation Meshfree (OTM) method and the variational thermomechanical constitutive updates, and simulation results including the compression ratio, material properties of the final product and orientation distribution of fibers are recorded. By comparing the simulation results with the experimental measurements, the computational framework is validated, which enables robust and efficient analysis of the sensitivity of the performance of composite materials on their processing parameters.

Multiobjective Optimization for Forming Process Parameters of Ultrahigh Strength Steel BR1500HS

“…Gleeble 1500 thermal simulation testing machine is used as shown in Figure 5(a). e test method as shown in Figure 5(b) is as follows: (1) samples are heated to 950°C at 10°C/s; (2) samples are put into the heating furnace for 120 s to make them fully austenite; (3) the heating sample is cooled down to 850°C at 30°C/s and kept heating preservation for 10s; (4) tensile experiment is conducted for each sample at a strain rate of 0.3 s −1 to a true strain of 0.2 with Gleeble 1500; and (5) these samples are cooled down at a cooling rate of 20°C/s, 30°C/s, 40°C/s, 50°C/s, 70°C/s, and 100°C/s to room temperature, respectively. Effects of cooling rate could be concluded by observing the microstructure of these samples.…”

“…If the usage of UHSS in auto body reaches up to 80%, the total weight of auto body decreases by 20% on the premise of the same cost [1]. us, the UHSS and its hot forming technology hold wide prospects in the automobile industry, especially for some critical crash components such as A-pillars, B-pillars, and side rails [2][3][4]. During the hot stamping process of UHSS, the blank is initially austenitization.…”

Phase Field Simulation of the Effect of Second Phase Particles with Different Orientations on the Microstructure of Magnesium Alloys

“…It has been shown that conducting material research solely through experimental methods not only incurs high costs, but also in many cases, leads to a lack of information on microstructure evolution mechanisms, and it cannot explain conflicting data, resulting in the inability to identify true patterns [14]. The advantages of numerical simulation techniques have been gradually highlighted with the progress of science and technology, and the use of computer technology to study modern science has become a proven scientific aid [15].…”