宁波大学学报（理工版）
寧波大學學報（理工版）
저파대학학보（리공판）
Journal of Ningbo University (Natural Science & Engineering Edition)
2015年
4期
129-132
,共4页
霍普金森拉杆%车身焊点%焊核%Cowper-Symonds 本构方程
霍普金森拉桿%車身銲點%銲覈%Cowper-Symonds 本構方程
곽보금삼랍간%차신한점%한핵%Cowper-Symonds 본구방정
Hopkinson bar%vehicle spot welding%welding%Cowper-Symonds%constitutive equation
以 DC53DZ 为基板,进行焊点结构的焊核区力学特性研究。通过设计试验试件并利用MTS 静态拉伸机及霍普金森拉杆(Split Hopkinson Tension Bar, SHTB)对其进行准静态拉伸及应变率600~1600 S-1之间的动态拉伸试验,得到焊核区的力学特性,并确立了其基于 Cowper-Symonds本构方程参数。利用数值仿真对焊核动态拉伸试验进行模拟,验证了设计试件的长宽比能使试件满足试验要求的轴向应力应变均匀状态。最后由模型中得到的焊核区应力－应变曲线与试验数据拟合,再现了焊核区材料特性试验曲线。验证了 DC53DZ 钢板的焊点焊核的本构方程参数的合理性。
以 DC53DZ 為基闆,進行銲點結構的銲覈區力學特性研究。通過設計試驗試件併利用MTS 靜態拉伸機及霍普金森拉桿(Split Hopkinson Tension Bar, SHTB)對其進行準靜態拉伸及應變率600~1600 S-1之間的動態拉伸試驗,得到銲覈區的力學特性,併確立瞭其基于 Cowper-Symonds本構方程參數。利用數值倣真對銲覈動態拉伸試驗進行模擬,驗證瞭設計試件的長寬比能使試件滿足試驗要求的軸嚮應力應變均勻狀態。最後由模型中得到的銲覈區應力－應變麯線與試驗數據擬閤,再現瞭銲覈區材料特性試驗麯線。驗證瞭 DC53DZ 鋼闆的銲點銲覈的本構方程參數的閤理性。
이 DC53DZ 위기판,진행한점결구적한핵구역학특성연구。통과설계시험시건병이용MTS 정태랍신궤급곽보금삼랍간(Split Hopkinson Tension Bar, SHTB)대기진행준정태랍신급응변솔600~1600 S-1지간적동태랍신시험,득도한핵구적역학특성,병학립료기기우 Cowper-Symonds본구방정삼수。이용수치방진대한핵동태랍신시험진행모의,험증료설계시건적장관비능사시건만족시험요구적축향응력응변균균상태。최후유모형중득도적한핵구응력－응변곡선여시험수거의합,재현료한핵구재료특성시험곡선。험증료 DC53DZ 강판적한점한핵적본구방정삼수적합이성。
The mechanical characteristics of nugget zone of spot welding based on steel DC53DZ is investigated. The test using MTS quasi static tensile test is conducted. Dynamic tensile test with the strain rate between 600-1 600 S-1 is carried out by applying Split Hopkinson Tension Bar (SHTP) to obtain the constitutive parameters of Cowper-Symonds model. Numerical simulation is carried out using LS-DYNA, and the result shows that both the stress and strain are uniformed within the specimen under the designed ratio of length-to-width. With the constitutive parameters obtained from the experiment, the simulated dynamic tensile test is in good agreement with the real-world test, indicating the validity of the dynamic tensile test in this paper.
