CAJ | 학술논문

针对橡胶隔振器疲劳寿命预测问题，基于哑铃型橡胶材料试片的疲劳寿命试验数据，建立橡胶隔振器的疲劳寿命预测模型，进而提出橡胶隔振器疲劳寿命预测的研究方案。设计了一哑铃型橡胶试片进行拉伸疲劳试验，实测其疲劳寿命数据并以最小二乘法拟合了该试片疲劳寿命的幂函数预测模型。再通过有限元方法计算了橡胶隔振器的三种常见的疲劳寿命评价参数：对数主应变、柯西主应力和应变能密度，最后将橡胶隔振器的疲劳寿命预测值与实测值进行比对。结果发现：当疲劳失效标准静为刚度降级25％时，三种疲劳寿命评价参数均能较好地拟合成幂函数疲劳寿命预测模型，对数主应变的预测值较为接近实测值、应变能密度参数的预测值约为实测值2倍左右、柯西主应力预测寿命的可靠性验证系数均接近5，且三种疲劳损伤评价参数的疲劳寿命拟合曲线形状均较为相似。
침대상효격진기피로수명예측문제，기우아령형상효재료시편적피로수명시험수거，건립상효격진기적피로수명예측모형，진이제출상효격진기피로수명예측적연구방안。설계료일아령형상효시편진행랍신피로시험，실측기피로수명수거병이최소이승법의합료해시편피로수명적멱함수예측모형。재통과유한원방법계산료상효격진기적삼충상견적피로수명평개삼수：대수주응변、가서주응력화응변능밀도，최후장상효격진기적피로수명예측치여실측치진행비대。결과발현：당피로실효표준정위강도강급25％시，삼충피로수명평개삼수균능교호지의합성멱함수피로수명예측모형，대수주응변적예측치교위접근실측치、응변능밀도삼수적예측치약위실측치2배좌우、가서주응력예측수명적가고성험증계수균접근5，차삼충피로손상평개삼수적피로수명의합곡선형상균교위상사。
In order to predict the fatigue life of rubber isolator,a prediction model was proposed on the basis of experimental data by using dumbbell-shaped rubber samples,thereby coming up with a corresponding prediction scheme. The fatigue tension experiment of a dumbbell-shaped rubber sample was devised,and the experimental data were observed.The prediction model in the form of a power function was fitted with the least square method.Thereafter,three common evaluation parameters including logarithmic principal strain,Cauchy principal stress and strain energy density for fatigue life were computed by using the finite element method.A comparison was made between the predicted and experimental data.It was concluded that all the three parameters can be effectively fitted with the prediction model in the same power function form when the fatigue failure standardy static stiffness drops 25 percent;specifically,the prediction value of logarithmic principal strain is close to the observation;the prediction magnitude of principal strain density is approximately double of the observation;and the reliability verification coefficient of the predicted fatigue life according to Cauchy principal stress approaches 5;the shapes of all the three fitted curves are similar.