• 소성∙가공
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• 제5권2호
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• pp.138-144
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• 1996

The differences of formability with maximum cup depth of drawn product and thickness strain distribution are compared for two kinds of blank shapes which are suggested optimum shape and conventional square shape. The suggested blank is determined by backward tracing technique of rigid-plastic FEM. The deeper cup without wrinkle and flange part could be obtained from the suggested blank shape however the cross sevtion sup from the square blank could not be kept smooth thickness strain distribution and defended those phenomena..

• 한국임상수의학회지
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• 제25권5호
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• pp.391-395
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• 2008

8세령 수컷 요크셔테리어 잡종견(몸무게: 7.5kg)이 운동불내성과 실신을 주증상으로 강원대학교 동물병원에 내원하였다. 초기 심장 검사에서 경미한 이첨판 역류증이외에 특별한 이상소편은 관찰되지 않았다. 운동내성검사에서 환자는 심각한 chronotrophic incompetence소견을 보였고, 1시간-디지털 심전도 검사에서 돌발적으로 발생하여 종료되는 발작성 동성 빈맥소견(심박수: 156-172회)을 보였다. 추가적인 미주신경 자극시험과 verapamil 반응시험에서 빈맥이 종료되는 소견을 보였다. 이러한 소견을 토대로 본 증례는 동방회귀성 빈맥증으로 진단내렸다. 환자는 diltiarem과 enalapril로 치료하였고, 한달 후 재검사에서 운동 불내성 소견은 지속적으로 보였지만, 추가적인 실신소견은 관찰되지 않았다.

• 소성∙가공
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• 제8권5호
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• pp.454-464
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• 1999

A new blank design method is proposed to predict the optimum initial blank shape in the sheet metal forming process. The rollback method for blank shape design takes the difference between the deformed blank contour and the target contour shape into account. the minimization object function R is proposed. Based on the method, a computer program composed of blank design module, FE-analysis module and mesh generation module is developed. The rollback method is applied to square cup, reentrant cross section, L-shaped cup drawing process with the flange of uniform size around its periphery to confirm its validity. The optimum initial blank shape is obtained from an arbitrary blank shape after several modifications. Good agreements are recognized between the numerical results and the published experimental results for initial blank shape and thickness strain distribution. It is concluded that the rollback method is an effective and convenient method for an optimum blank shape design.