• 한국자동차공학회논문집
• /
• 제6권3호
• /
• pp.123-137
• /
• 1998

The finite deformation with self contact problem of C. V. joint boots is analysed by using the implicit finite element code ABAQUS/Standard. It is shown that analysis results have a good agreement with experimental ones to the degree of maximum rotation angle. As an application of design modification, the effects of thickness change of the rounded part of boot model on the bending and the contact situation of deformed geometry are investigated. In this paper, the effect of the design modification in the end on the leakage is examined using 2-D finite element simulation. To solve the leakage problem of grease, the length of the small end is enlarged. From this study, it is confirmed that we can save the cost and time by applying FEM techniques to analyze and design the boot model.

• 한국가스학회지
• /
• 제19권1호
• /
• pp.6-11
• /
• 2015

이 논문은 자동차 타이밍벨트, 등속조인트 부트, 웨더 스트립에 적용되는 고무시스템의 손상이나 내구성 약화에 대한 사례 연구를 하는 것이 목적이다. 첫 번째 사례에서는 신품의 타이밍 벨트를 교환할 때 벨트의 내구성이 떨어진 벨트를 교환하여 타이밍 벨트와 스프로킷의 마찰작용에 의해 비정상적으로 타이밍 벨트 캔버스가 마멸된 것을 확인하였다. 두 번째 사례에서는 등속 조인트에 그리스의 밀봉역할을 하는 고무 부트의 내구성이 떨어져 경화되고 갈라져 이 틈으로 그리스가 누설된 것을 확인하였다. 세 번째 사례에서는 웨더 스트립이 화학적 변화에 따른 균열로 재료 변형이 생겨 웨더 스트립 고무가 찢어졌다. 이러한 현상은 문을 닫을 때 웨더 스트립 고무를 겹쳐지게 해 운행중 외부공기가 유입되어 미세한 소음이 발생되는 것을 확인했다.따라서, 자동차에 적용되는 고무재질의 부품들의 내구성 약화나 손상으로 인한 자동차의 고장사례가 발생하지 않도록 관리하여야 한다.

• 대한기계학회논문집 C: 기술과 교육
• /
• 제3권2호
• /
• pp.97-106
• /
• 2015

Flexible structures are often important components of mechanical assemblies in motion. A flexible structure sometimes must go through assembly steps that cause it to be in a pre-stressed condition when in the starting position for operation. A virtual prototype of the assembly must also bring the model of the flexible structure into the same pre-stressed condition in order to obtain accurate simulation results. This case study is presented regarding the simulation of a constant velocity joint, with a focus on the flexible boot. The case study demonstrates that careful definition of the initial conditions of the boot and flexible body contacts yields high-fidelity simulation results.

• 대한기계학회논문집A
• /
• 제21권12호
• /
• pp.2121-2133
• /
• 1997

A finite element code is developed for 3-D self-contact problems, using continuum elements with a SRI(Selective Reduced Integration) scheme to prevent locking phenomenon by the incompressibility of rubber. Contact treatment is carried out in two ways : using the displacement constraints in case of rigid contact ; and imposing the same contact forces on two contact boundaries in case of self-contact. The finite element code developed is applied to the deformation analysis of C.V.joint boots which maintain lubrication conditions and protect the C.V.joint assembly from impact and dust. The boot accompanies large rotation depending on the rotation of the wheel axis and leading to the self-contact phenomena of the boot bellows. Since this contact phenomenon causes wear of the product and has great influence on the endurance life of the product, it is indispensable to carry out stress analysis of the rubber boots. In case of self-contact, various methods for determining contact forces have been suggested with an appropriate contact formulation. Especially, the types of penetration in self-contact are modularized to accelerate conputation with a contact algorithm.