西安建筑科技大学学报(自然科学版)

分别对取自Q460D高强钢及对应的ER55-G型焊材的9个光滑圆棒试件和18个圆周平滑槽口试件进行单向拉伸试验,获得基本的力学性能参数、荷载—位移曲线和真实的应力—应变曲线.并通过对18个圆周平滑槽口试件的有限元模拟结果与试验数据进行对比,标定得到Q460D高强钢材及对应的ER55-G型焊材的GTN损伤模型参数.利用标定的GTN模型损伤参数对在Q460D高强钢及对应的ER55-G型焊材取材的圆棒试件的断裂点进行预测,验证所标定参数的准确性.并进一步分析初始微孔洞体积比f0、临界微孔洞体积比fc、最大微孔洞体积比fF和形核孔洞体积分数fN四个损伤参数对断裂预测结果的影响.

The monotonic loading tests were carried out on nine smooth round bars and eighteen circumferentially smooth-notched bar specimens of Q460D high strength steel and the corresponding ER55-G welding material to obtain the basic mechanical properties, load-displacement curves and true stress-strain curves. The GTN model parameters of Q460D high strength steel and the corresponding ER55-G welding material were calibrated according to the experimental and finite element analysis results of eighteen circumferentially smooth-notched bar specimens subjected to monotonic loading. Moreover, the calibrated GTN damage parameters were used to forecast the fracture points of coupon specimens of Q460D high strength steel and the corresponding ER55-G welding material, so as to verify the accuracy of the calibrated parameters. Furthermore, the influences of four damage parameters, including initial void volume fraction f0, critical void volume fraction fc, final failure void volume fraction fF and nucleating volume fraction fN, on fracture prediction results were further analyzed.

引言
1 GTN模型
2 试验研究
3 GTN模型参数标定
4 损伤参数的影响
5 结论

图1 Q460D高强钢材取样示意图(单位mm)<br/>Fig.1 Sample drawing of Q460D high strength steel /mm

图1 Q460D高强钢材取样示意图(单位mm)
Fig.1 Sample drawing of Q460D high strength steel /mm

图2 ER55-G型焊材取样示意图<br/>Fig.2 Sample drawing of ER55-G welding material

图2 ER55-G型焊材取样示意图
Fig.2 Sample drawing of ER55-G welding material

表1 Q460D钢材及ER55-G型焊材的化学成分<br/>Tab.1 Chemical components of Q460D steel and ER55-G welding material%

表1 Q460D钢材及ER55-G型焊材的化学成分
Tab.1 Chemical components of Q460D steel and ER55-G welding material%

图3 单向拉伸试件几何尺寸(单位mm)<br/>Fig.3 Unidirectional tensile test piece geometry /mm

图3 单向拉伸试件几何尺寸(单位mm)
Fig.3 Unidirectional tensile test piece geometry /mm

图4 制作好的试件(槽口半径R=3.125)<br/>Fig.4 The finished specimen(Notch radius R=3.125)

图4 制作好的试件(槽口半径R=3.125)
Fig.4 The finished specimen(Notch radius R=3.125)

表2 光滑圆棒试件编号与尺寸<br/>Tab.2 Notation and size of smooth specimens

表2 光滑圆棒试件编号与尺寸
Tab.2 Notation and size of smooth specimens

表3 圆周平滑槽口圆棒试件编号和尺寸<br/>Tab.3 Notation and size of smooth-notched coupon specimens

表3 圆周平滑槽口圆棒试件编号和尺寸
Tab.3 Notation and size of smooth-notched coupon specimens

表4 单向拉伸试验结果<br/>Tab.4 Results of unidirectional tensile test

表4 单向拉伸试验结果
Tab.4 Results of unidirectional tensile test

图5 真实应力 - 塑性应变曲线<br/>Fig.5 True stress-strain curve

图5 真实应力 - 塑性应变曲线
Fig.5 True stress-strain curve

表5 单向拉伸试件断裂时的真实应力和应变<br/>Tab.5 The true stress and strain of unidirectional tension specimen

表5 单向拉伸试件断裂时的真实应力和应变
Tab.5 The true stress and strain of unidirectional tension specimen

图6 正在进行单向拉伸试验的试件<br/>Fig.6 Specimen undergoing unidirectional tensile test

图6 正在进行单向拉伸试验的试件
Fig.6 Specimen undergoing unidirectional tensile test

图7 Q460D高强钢圆周平滑槽口圆棒试件单向拉伸试验结果<br/>Fig.7 Unidirectional tensile test results of smooth- notched coupon specimens of Q460D high strength steel

图7 Q460D高强钢圆周平滑槽口圆棒试件单向拉伸试验结果
Fig.7 Unidirectional tensile test results of smooth- notched coupon specimens of Q460D high strength steel

图8 部分拉断的试件<br/>Fig.8 Some of the broken specimen

图8 部分拉断的试件
Fig.8 Some of the broken specimen

图9 圆周平滑槽口圆棒的有限元模型(R=1.5)<br/>Fig.9 The finite element model of smooth-notched coupon specimens(R=1.5)

图9 圆周平滑槽口圆棒的有限元模型(R=1.5)
Fig.9 The finite element model of smooth-notched coupon specimens(R=1.5)

图10 圆周平滑槽口试件荷载—位移曲线<br/>Fig.10 Load-displacement curves of smooth-notched coupon specimens

图10 圆周平滑槽口试件荷载—位移曲线
Fig.10 Load-displacement curves of smooth-notched coupon specimens

表6 Q460D高强钢及对应的ER55-G型焊材的GTN模型损伤参数<br/>Tab.6 GTN damage parameters of Q460D high strength steel and the corresponding ER55-G welding material

表6 Q460D高强钢及对应的ER55-G型焊材的GTN模型损伤参数
Tab.6 GTN damage parameters of Q460D high strength steel and the corresponding ER55-G welding material

图11 f0取值不同时试件ER2-9的荷载 - 位移曲线<br/>Fig.11 Load-displacement curves of specimen ER2-9 with different f0

图11 f0取值不同时试件ER2-9的荷载 - 位移曲线
Fig.11 Load-displacement curves of specimen ER2-9 with different f0

图12 fc取值不同时试件ER2-9的荷载 - 位移曲线<br/>Fig.12 Load-displacement curves of specimen ER2-9 with different fc

图12 fc取值不同时试件ER2-9的荷载 - 位移曲线
Fig.12 Load-displacement curves of specimen ER2-9 with different fc

图13 fF取值不同时试件ER2-9的荷载 - 位移曲线<br/>Fig.13 Load-displacement curves of specimen ER2-9 with different fF

图13 fF取值不同时试件ER2-9的荷载 - 位移曲线
Fig.13 Load-displacement curves of specimen ER2-9 with different fF

图14 fN取值不同时试件ER2-9的荷载 - 位移曲线<br/>Fig.14 Load-displacement curves of specimen ER2-9 with different fN

图14 fN取值不同时试件ER2-9的荷载 - 位移曲线
Fig.14 Load-displacement curves of specimen ER2-9 with different fN

[1] 班慧勇, 施刚, 石永久,等. 建筑结构用高强度钢材力学性能研究进展[J]. 建筑结构, 2013, 43(2): 88-94,67.
[2] 王元清, 林云, 周晖,等. 高强度钢材及其焊缝脆性断裂与疲劳性能的研究进展[J]. 建筑钢结构进展, 2012, 14(5): 21-28.
[3] BAN H Y, SHI G, SHI Y J, et al. Research progress on the mechanical property of high strength structural steels [J]. Advanced Materials Research, 2011, 250(3):640-648.
[4] 施刚, 班慧勇, 石永久,等. 高强度钢材钢结构研究进展综述[J]. 工程力学, 2013, 30(1): 1-13.
[5] BUSCH J F. Tale of two populations: thermal comfort in air-conditioned and naturally ventilated offices in Thailand [J]. Energy & Buildings, 2014, 18(3/14):235-249.
[6] De Dear R J, Leow K G, Foo S C, Thermal comfort in the humid tropics: Field experiments in air conditioned and naturally ventilated buildings in Singapore [J]. International Journal of Biometeorology, 1991, 34(4): 259-265.
[7] TVERGAARD V. On localization in ductile materials containing spherical voids [J]. International Journal of Fracture, 1982, 18(4):237-252.
[8] 王涛, 庄新村, 赵震. GTN模型的现状与发展[C]//第十三届全国塑性工程学术年会暨第五届全球华人塑性技术研讨会论文集. 武汉:中国机械工程学会. 2013: 61-64.
[9] 黄学伟, 赵军, 郑植等. Q690D高强度钢材GTN模型的参数标定和应用[J]. 工业建筑, 2018, 48(8): 163-168.
[10]涂立尚. Q460D钢母材及ER55-G型焊材微观断裂模型参数影响因素研究[D]. 西安:长安大学, 2018.
[11]CHU C C, NEEDLEMAN A. Void nucleations effects in biaxially stretched sheets [J]. Journal of Engineering Materials and Technology, 1980, 102(3): 249-256.
[12]CORIGLIANO A, MARIANI S, ORSATTI B. Identification of gurson tvergaard material model parameters via kalman filtering technique. I. Theory [J]. International Journal of Fracture, 2000, 104(4): 349-373.
[13]邢佶慧, 史一剑, 刘文涛, 等.建筑钢材 GTN 损伤模型参数识别[J]. 建筑结构学报, 2014, 35(4): 149-154.
[14]SUN D Z, KIENZLER R, VOSS B, et al. Application of micromechanical models to the prediction of ductile fracture[C]//Fracture Mechanics 22nd Symposium. Philadelphia: ASTM, 1992, II: 368-378.
[15]GAO X S, KIM J. Modeling of ductile fracture: Significance of void coalescence [J]. International Journal of Solids and Structures, 2006, 43(20): 6277-6293.
[16]ZHANG Z L, HAUGE M. On the gurson micromechanical parameters [J]. Fatigue and Fracture Mechanics, 1999, 29: 364-383.
[17]BROWN L M, EMBURY J D. The initiation and growth of voids at second phase particles [C] // Proceedings of the third international conference of the strength of metals and alloys. Cambridge: ICSMA, 1973: 164-169.
[18]WEST O, LIAN J H. Numerical determination of the damage parameters of a dual-phase sheet steel [J]. ISIJ International, 2012, 52(4): 743-752.

备注

引言

1 GTN模型

2 试验研究

3 GTN模型参数标定

4 损伤参数的影响

5 结论

期刊信息