有限元分析應(yīng)變率作用ppt課件

1、緩沖結(jié)構(gòu)慣性、應(yīng)變率效應(yīng)緩沖結(jié)構(gòu)慣性、應(yīng)變率效應(yīng)Inertia and strain rate effect on the dynamic response of multi-layered cushioning structure兩個(gè)動(dòng)態(tài)原理兩個(gè)動(dòng)態(tài)原理算例算例壓力室沖擊桿應(yīng)變片應(yīng)變片測(cè)量?jī)x示波器數(shù)據(jù)采集投射桿入射桿試樣沖擊桿力傳感器試樣飛輪氣壓千斤頂杠桿激光傳感器保險(xiǎn)梁保險(xiǎn)梁樞軸連接 000( )( )( )( )( )( )/( )( )x tVx t dtx tx t dttmx tAx tth000()()()iRTuf xc tug xc tuh xc t1001111001100

2、0()()()iRttiRuf xc tg xc tufgxuvc fc gtuv dcd 202220200()TtTuh xc tuhxvcucd 設(shè)質(zhì)點(diǎn)位移設(shè)質(zhì)點(diǎn)位移:iRT021000()tsTiRcuudll 平均應(yīng)變：平均應(yīng)變：動(dòng)態(tài)平衡：動(dòng)態(tài)平衡：00002tsRsTcdlEAA 邱信明,清華大學(xué) 教授，博士生導(dǎo)師目前研究方向側(cè)重于輕質(zhì)結(jié)構(gòu)的力學(xué)性能研究，結(jié)構(gòu)的動(dòng)態(tài)響應(yīng)，非線性斷裂力學(xué)的理論分析和數(shù)值模擬仿真。222yQdmdxtxdm=1Adx與21()yQfAx 112122112221212()1,0()1,(),0(, )0(0,0)yfxxhxyytfxhxhhxymyf

3、xxAty hh tyVt 1(1)1ydmdxyxxf1()=a1+tan(a2),f2()=b1tanh(b2)+b3tan(b4), a1=0.1 MPa, a2=0.01 MPa, a3=1.91 rad, b1=0.08 MPa, b2=23 rad, b3=0.005 MPa, b4=2.2 rad,m=5 kg,h1=0.035 m,h2=0.015 m.212322221233122122221 223 4411222212tan(),01sec (),01/cosh ()sec (),(, )0, ( ,0)0(0,0)yAyyaaaxtmxxyyyaa aaxhtxxyyyybbbb bbhxhhtxxxy hh ty xyVt 圖3 應(yīng)力-應(yīng)變曲線(m=5,V=3) 圖4 應(yīng)力-應(yīng)變曲線(m=2,V=5)Saint-Michel F, Chazeau L., Cavaille J.-Y, et al. Mechanical properties of high density polyurethane foams:I. Effect of the dens