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디젤 엔진용 소성역 체결 MAIN BEARING CAP BOLT의 재사용 연구
김순식(Soonsik Kim),이준항(Joonhang Lee),서승형(Seunghyoug Seo),박익순(Iksoon Park) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_3
The plastic region tightening bolt is usually used for the crank shaft main bearing cap bolt of the diesel engine. If the plastic region tightening bolt is repeatedly reused, it would be subject to the accumulated permanent strain and lowering the bolt axial force only to cause some serious problems. The crank shaft main bearing cap bolt as much as 20 times for a testing with the torque-tension tester. As a result, the max. axial force was reached when the bolt was 10 times, but in consideration of about 5% safety rate of the axial force as well as the ordinary 0.2-0.5% permanent strain, it was deemed desirable to reuse the bolt only 3 times.