Abstract The use of press-hardening steels (PHSs) in automotive bodies creates the opportunity producing thinner, higher-strength components. PHS1800, an Al-Si coated PHS grade with ultimate tensile strength around 1.8 GPa after hot stamping, is a candidate material for vehicle anti-intrusion applications. current study aims to investigate formability this steel during hot-stamping process. A c...

This work established strain-based forming limit diagrams (FLDs) for DP600 steel sheets by means of experimental investigation and theoretical prediction. The results showed that compared to the curve (FLC), predicted Keeler equation, FLCs Hill’79 yield criterion, or Logan-Hosford were more suitable predicting sheets. Solutions from analytical methods FLD, based on combining uniaxial tensile te...

Forming limit curves (FLC) of deep drawing steel sheets have been determined experimentally and calculated on the base of the material tensile properties following the Hill, Swift, Marciniak-Kuczyński and Sing-Rao methods. Only the FLC modeled from a singly linear forming limit stress curve exhibits good consistence with experimental curve. It was established that a linearized limit stress locu...

In this paper, Computer Aided Designing (CAD) in conjunction with Rapid Tooling is applied to design and produce forming tools (punch and die) for stretch-formed jewelry (generated on thin sheet metal on top of which jewelry patterns are raised with forming tools by stretching the sheet metal beyond its elastic limit. The work presents a parametric voxel based CAD paradigm for modeling of such ...

We analytically investigate the formation of an HII region in the accreting envelope of a newborn star. Special care is taken to examine the role of ionizing radiation force. This effect modifies velocity and density distributions and thereby affects the expansion of the HII region. As a result, the upper limit of the stellar mass imposed by the growth of an HII region around a forming star is ...

the aim of this paper is to develop a systematic method to analyze the effects of forming parameters on the quality of part formability and determine the optimal combination of the forming parameters for the sheet hydroforming process. in this paper, the effects of four important process parameters namely fluid pressure, friction coefficient at blank/punch interface, gap between die rim block a...

the present article studies the quran's view on free will and freedom. some related issues discussed here are: (1) human freedom is the basis of the creation; (2) respecting human freedom is the basis of the prophet's invitation of the people to islam; (3) political freedom is the foundation of forming political societies, and so on. with reference to the quranic verses and moslem sch...