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Experimental and numerical analyses on crushing behaviour of drawn cups of laser welded tailored blanks under axial loading

Katiyar Bhupesh Singh, Panda Sushanta Kumar, Saha Partha

Archives of Civil and Mechanical Engineering

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2022

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Vol. 22, no. 4

art. no. e211, 2022

EN

It is imperative to characterize the crushing behaviour of deep drawn components of tailor welded blanks for their wide applications in different autobody structures. In the present work, extra deep drawing steel sheets were laser welded to produce welded blanks of similar thickness and dissimilar thickness (LWTBs), and these were deformed using a two stage deep drawing setup to fabricate geometrically similar drawn cups consisting of both hemispherical and cylindrical segments. Subsequently, these drawn cups were axially crushed between two flat platens to study collapse modes, load–displacement responses and energy absorption capabilities. The collapse of the drawn cups was found to onset with an inward dimpling of the hemispherical segment. As deformation progressed, the folding of cylindrical section occurred either axisymmetrically or unevenly based on the extent of non-uniform thickness variations across the weld zone (WZ). It was also found that the load–displacement response and energy absorption of the cups were enhanced because of the presence of WZ and thickness difference in LWTBs. Also, finite element-based numerical models were developed to collate the prediction capabilities of three different anisotropic material models viz. Hill48, YLD89, and Stoughton non-associated flow rule (S-NAFR)-based model. All these material models were successfully calibrated to predict the collapse modes, but the S-NAFR model was found to closely predict the load–displacement curves and energy absorption. Furthermore, the assessment of specific energy absorption and crushing force efficiency suggested that lightweight LWTB components can be fabricated with improved crashworthiness performance using sheet materials of different thickness.

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Proces technologiczny kucia półfabrykatu wałka rozrządu

Panasiuk K.

Zeszyty Naukowe Akademii Morskiej w Gdyni

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2017

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nr 100

141--151

PL

W artykule podjęto temat procesu technologicznego kucia półfabrykatu wałka rozrządu. Scharakteryzowano materiały stosowane na półfabrykaty wałków rozrządu. Określono warunki doboru technologii wytwarzania półfabrykatów. Przedstawiono proces kucia i matrycowania. Dokonano też opisu prac kończących produkcję półfabrykatów wałków rozrządu. Opracowano kartę technologiczną dla procesu kucia.

EN

The article presents technological process of forging blank camshafts. It describes materials used on the camshafts blanks. The paper also sets out the conditions for the selection of manufacturing technology of semi-finished products. It shows the process of forging and stamping. The ending work in the production process of semi-finished products is described. The card for forging process of semi-finished camshafts is developed.

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The starting diameter of a semi-finished product for thread rolling

Łyczko K.

Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika

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2002

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z. 58 [193]

233-240

EN

An analytical method for the determination of the starting diameter of a semi-finished product to be used for rolling metric and unified threads with a triangular, a trapezoid and a circular contours has been presented. The result of computations for selected types of threads, while considering the accuracy class, is provided. An example of a computation program is given.