철도 노반의 누적영구변형 예측을 위한 shakedown 탄소성 모델

초록

It is important to control permanent plastic deformation for long-term maintenance of safe railway system. A single cyclic load produces a dimimutive plastic strain which may be small enough to ignore in a engineering sense. However, this small plastic strains are accumulated because of hundred thousand passages of trains over years, thus are likely to cause significant deformation in the roadbed. Actual simulation of full stress-straiin behavior for a full cyclic load would be meaningless and time consuming. In this study, a shakedown plastic model based on the conventional elasto-plastic theory is presented and its results are compared with measurements.