• Title/Summary/Keyword: Equi-strain line

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The Optimal Design of Preform in 3-D Forging by using Electric Field Theory (전기장 이론을 이용한 3차원 단조공정에서의 예비형상 설계)

  • 신현기;이석렬;박철현;양동열
    • Transactions of Materials Processing
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    • v.11 no.2
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    • pp.165-170
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    • 2002
  • The preform design of forging processes plays a key role in improving product qualities, such as defect prevention, dimensional accuracy and mechanical strengths. In the industry, preforms are generally designed by the iterative trial-and-error approach, but it results in significant tooling cost and time. It is thus necessary to minimize lead-time and human intervention through an effective preform design method. In this paper, the equi-potential lines designed in the electric field are introduced to find the preform shape, and then the optimization process is used to choose the equi-potential lines that will keep the die wear to a minimum Because, in the forging process, the die wear is a function of various important factors, such as forming stress and strain, microstructure and mechanical properties of a Product.

Stress-strain Behavior of Remolded Clay Using Different Shear Rate and Plastic Indices (전단속도와 소성지수를 달리한 재생성 점성토의 응력-변형률 거동)

  • Lee, Yonghee;Kang, Kwon-Soo;Jung, Sang-Guk;Kang, Jintae;Kim, Daehyeon
    • Journal of the Korean GEO-environmental Society
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    • v.12 no.1
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    • pp.27-33
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    • 2011
  • In general, the shear strength of a clay specimen under the direct shear test and the triaxial compression test increases with an increase in the shear rate. This study investigates the effects of shear rate and silt content on the stress-strain behavior of remolded Gwangyang clay, by changing the shear rate and the silt content. Based on the results of the triaxial compression tests, the equi-strain line of remolded Gwangyang clay shows initially positive slope and then becomes flat at certain strain level. As the strain level where the equistrain becomes flat is different depending on the soil with different silt contents, this can be considered as the inherent property of soil.