in a closed die forging process, it is impossible to form complex shapes in one stage, and thus it becomes necessary to use preform dies. in the present study, backward deformation method and fe simulation via abaqus software has been used in order to design preform die of the h-shaped parts. in the backward deformation method, the final shape of the part is considered as a starting point and u...

in this paper, a systematic approach is presented for optimal design of tunnel support lining using two-dimensional finite element analysis models of soil-structure interaction developed in abaqus software and the modified colliding bodies optimization (mcbo) algorithm implemented in matlab environment. this approach is then employed to study the influence of variable geometrical and geo-mechan...

Healthy bones adapt to mechanical stimulus in a process known as bone remodeling. More specifically, the apparent density of bone tissue is directly related to the load it bears over time. For example, after long periods in a microgravity environment astronauts experience a loss of bone density because of skeletal unloading, while most professional tennis players experience a gain of bone densi...

The most important purpose of cold rolling processes, in addition to obtaining appropriate mechanical features, is to achieve very low and more precise thicknesses’, the issue that is not possible in hot rolling processes. Today, most cold rolling lines designed continuously and usually consist of 4 to 6 fourroller rolling rack. Finished surface of obtained sheets of cold rolling is Harder and ...

Virtual design tools are gaining more and more importance in the production process of medical devices. Biomedical devices and their surrounding boundary conditions are usually characterized by complex geometrical shapes, materials and interactions, and current Abaqus capabilities in dealing with highly non-linear problems are highly needed to realistically capture these complexities. As an exa...

The lobes of the NASA ULDB pumpkin-shaped super-pressure balloons are made of a thin polymeric film that shows considerable time-dependent behaviour. A nonlinear viscoelastic model based on experimental measurements has been recently established for this film. This paper presents a simulation of the viscoelastic behaviour of ULDB balloons with the finite element software ABAQUS. First, the stan...

Methods in detecting damages in structural components and monitoring their health is on the way to develop in today’s technology. Approaches; nondestructive towards the part or with the lowest risk; which locate the damage and even diagnose its size, are accentuating the importance of smart materials. One of these materials are piezoelectric that is used both as transducers and actuators in res...

This paper presents the mixed mode I/II stress intensity factors (SIFs) of slanted cracks/notches under tension loading. A two-dimensional finite element analysis (FEA) was employed using ABAQUS program. Based on literature survey, there is a lack solutions for SIFs cracks in plane plates. The strain energy approach (SEA) adopted to analyze notched cases. Mode I and II are derived via SEA metho...