Resistance spot welding (RSW) includes many variables that can influence the weld properties. The purpose of this study is to develop an analytical model for prediction of thermal history and weld microstructure in RSW and to find the most important process parameters that influence the weld microstructure. A one dimensional model is proposed for prediction about thermal history during cooling ...

The effects of stress and plastic strain distributions on the hydrogen embrittlement fracture U-bent martensitic steel sheet specimen were investigated. testing was performed. Fracture morphology mainly consisting intergranular found inside charged specimen, which indicated that crack initiation took place in interior, shear lips near both surfaces sheet. synchrotron X-ray diffraction measureme...

For realization of micro fluid power sources applicable to microfactory or micromachines using fluid power with high power density, a resonantly-driven piezoelectric micropump with newly devised check valve unit is developed and a practical application to micro press is attempted. First, a micro sheet valve having a floating valve-body inside valve chest to increase valve-opening and to decreas...

struggling in world's competitive markets, industries are attempting to upgrade their technologies aiming at improving the quality and minimizing the waste and cutting the price. industry tries to develop their technology in order to improve quality via proactive quality control. this paper studies the possible paint quality in order to reduce the defects through neural network techniques in au...

A multifunctional panel concept is presented in which a lightweight, structurally efficient sandwich panel is able to undergo a reversible change in shape upon application of a localized thermal stimulus while supporting significant load. The shape change is effected by shape memory alloy face sheet elements, which exploit a ‘‘one-way’’ shape memory effect only. Unlike other related designs, no...

Abstract In order to accurately predict and reduce the possible defects in stamping process of an aluminum alloy sheet, simulation data sheet thickness for 6016 were obtained by Hill’48 yield criterion based on finite element ABAQUS/Explicit solver. Taking blank holder force, friction coefficient, speed, die clearance as input parameters, radial basis function (RBF) network model predicting max...

In this paper, a mathematical model for symmetrical multi-layer sheet rolling, in which the layers are unbounded before rolling, by using the upper bound method and stream function theorem is proposed. Using this model, we can investigate the plastic deformation behavior of sheets at the roll gap during rolling. Effect of various rolling conditions such as initial and final thickness and flow s...

In recent years, hydroforming process has been applied in different industries such as aerospace, automotive and military industries due to its advantages, such as high dimensional accuracy, capability of forming complicated parts and high drawing ratio. Hydrodynamic deep drawing with radial pressure is one type of hydroforming process. In this paper, forming of cylindrical cups in hydrodynamic...

In this paper, the typical U-shaped pieces were taken as the object of study and the finite element numerical simulation software Dynaform is applied to simulate the effect of sheet metal bending. The U-shaped bending spring back and its thickness change are analyzed. The influence law of main parameters of die structure to sheet thickness change and the spring back amount are obtained by combi...

1. Project co-financed by the European Regional Development Fund under Operational Programme Innovative Economy and National Centre for Research Poland (NCBR ) – Grant No. INNOLOT/I/9/NCBR/2013 (2013-2018) CASELOT.