This thesis investigates the mechanical behavior of a new type of formable all-metal bi-directionally corrugated sandwich sheet material. Unlike conventional flat sandwich panel materials, this type of sandwich sheet material can be formed into three-dimensional shapes using traditional sheet metal forming techniques. In a first step, the core structure geometry is optimized such as to offer th...

Bending angle obtained in laser forming process is much smaller than that conventional die pressing or roller bending processes. Therefore, multi-stage necessary to form deep drawn shapes and/or complex by forming. However, irradiation varies material properties, posture, and stiffness of metal plates, those influences are accumulated during the consecutive stages process. Thus, thermo-elasto-p...

This paper presents the post-forming limits of polyamide 6 carbon (CF/PA6) thermoplastic tubes to facilitate design and process optimisation bent tubular CF/PA6 part manufacturing. Straight can be post-formed using rotary draw bending at elevated temperature achieve desired curvatures. Forming are predicted based on their winding angles, tube geometry, radius, presented as relation between angl...

In the present paper, the different techniques used for the determination of changes of surface stress of solid electrodes, as well as the kind and quality of information that can be achieved using these methods are discussed. The most important methods are briefly reviewed and advantages/drawbacks highlighted. Special attention is paid to issues related to the use of the “bending beam” (“bendi...

Intermolecular interactions between charged membranes and biological polyelectrolytes, tuned by physical parameters, which include the membrane charge density and bending rigidity, the membrane spontaneous curvature, the biopolymer curvature, and the overall charge of the complex, lead to distinct structures and morphologies. The self-assembly of cationic liposome-microtubule (MT) complexes was...

According to the direct homogenization theory of inhomogeneous material, a single medium homogenization constitutive model of the confined concrete in the steel box-concrete combined member has been established, and model parameters have been determined by the measured data of the bending test. By analyzing the theoretical ultimate strength and overall process curve, the results obtained is con...

A simplified (one step) method called “inverse approach” (IA) for the numerical analysis of the stamping process has been continuously developed by the authors since the end of the eighties. In the present paper we recall the main finite element formulation aspects, for an efficient estimation of the large elastoplastic strains encountered in deep drawing operations. The capabilities of the cod...

Sheet metal bending press-brakes can be setup to produce more than one type of part without requiring a setup change. To exploit this flexibility, we need setup planning techniques so that press-brake setups can be shared among many different parts. In this paper, we describe algorithms for partitioning a given set of parts into setup compatible part families that can be produced on the same se...

Simulations of composite reinforcements draping use shell finite elements for which the bending behaviour is very particular. The fibrous composition significantly reduces stiffness compared to classical materials. Moreover, kinematics deformation strongly modified and does not follow theories such as Kirchhoff's. objective this paper show that a approach based on quasi-inextensibility fibres m...

Abstract Bending deformation is a typical forming method in the manufacturing process of mechanical equipment. NM450 wear-resistant steel with high strength vulnerable to bending failure, thus decreasing bendability. The changes microstructure and properties during were studied by scanning electron microscopy, energy dispersive spectroscopy, optical transmission backscattered diffractometer met...