车辆激光拼焊板失效模式预测及有限元验证

拼焊板技术在汽车制造中得到了广泛应用,但也面临成形性下降的挑战。失效模式是拼焊板成形过程中的关键特征,要改善拼焊板成形性能,必须对失效模式进行预测。为了预测成形后拼焊板的失效模式,该文以汽车激光拼焊板为对象建立了拼焊板临界板厚比解析模型。结合理论解析法、有限元及试验法研究了拼焊板两侧母材的厚度之比（板厚比）与拼焊板母材材料参数及应变状态之间的关系,建立了拼焊板失效模式预测模型。基于等双拉应变状态,分别采用理论模型和有限元法计算出2种不同拼焊板临界板厚比。比较2种方法获得的临界板厚比,误差分别为7.76%和6.15%,处于可接受范围。结果表明,所建立的临界板厚比解析模型是合理的,能有效预测拼焊板...

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Bibliographic Details
Published in农业工程学报 Vol. 29; no. 12; pp. 57 - 63
Main Author 陈水生 林建平 王裕清
Format Journal Article
LanguageChinese
Published 河南理工大学机械与动力工程学院,焦作,454000%同济大学机械与能源工程学院,上海,201804 2013
Subjects
临界板厚比
失效模式
焊接
解析模型
车辆
车辆
失效模式
welds
failure modes
焊接
临界板厚比
critical thickness ratio
解析模型
vehicles
analytical model
Online AccessGet full text
ISSN1002-6819
DOI10.3969/j.issn.1002-6819.2013.12.008

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Summary:拼焊板技术在汽车制造中得到了广泛应用,但也面临成形性下降的挑战。失效模式是拼焊板成形过程中的关键特征,要改善拼焊板成形性能,必须对失效模式进行预测。为了预测成形后拼焊板的失效模式,该文以汽车激光拼焊板为对象建立了拼焊板临界板厚比解析模型。结合理论解析法、有限元及试验法研究了拼焊板两侧母材的厚度之比（板厚比）与拼焊板母材材料参数及应变状态之间的关系,建立了拼焊板失效模式预测模型。基于等双拉应变状态,分别采用理论模型和有限元法计算出2种不同拼焊板临界板厚比。比较2种方法获得的临界板厚比,误差分别为7.76%和6.15%,处于可接受范围。结果表明,所建立的临界板厚比解析模型是合理的,能有效预测拼焊板变形过程中的失效模式。
Bibliography:11-2047/S
vehicles; welds; failure modes; analytical model; critical thickness ratio
Chen Shuisheng, Lin Jianping, Wang Yuqing （1. School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo 454000, China; 2. School of Mechanical and Energy Engineering, Tong~i University, Shanghai 201804, China）
Tailor welded blanks（TWB＇s） consist of steel sheets with different materials,thickness,and coating welded into a single flat blank prior to forming in order to meet the different needs for various positions of parts.TWB＇s provide various advantages,namely,reduction of weight,fuel consumption and air pollution,lower manufacturing costs,and improved structural integrity over conventional sheet metal forming methods.However,the degradation of TWB＇s formability causes current applications to be limited.In order to take advantage of these benefits,we need to understand the characteristics related to TWB＇s forming,and especially be able to predict the failure modes during the press forming.Some important
ISSN:1002-6819
DOI:10.3969/j.issn.1002-6819.2013.12.008