焊接残余应力与变形(II)
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Length Scale in Surface Residual Stress
Distributions - sqrt(rt)
表面长尺度残余应力分布-sqrt(rt)
Longitudinal versus Transverse Residual Stresses
纵向与横向残余应力对比
Longitudinal component 纵向部分
图例—平板对接焊缝
Yield magnitude tension within or near weld
焊缝内或附近产生巨大拉力
Dying out rapidly and become compression
away from weld
在远离焊缝处迅速衰减且变成压力
Transverse component: very sensitive to
Transverse Component in Repair Weld Strongly
Depends on Repair Dimensions
补焊的横向分量主要取决于修复尺寸
理解特殊应用需求的重要性
Cutting accuracy control
精确控制切割
Long range residual stress is of interest
注意大范围内的残余应力
Best described at the midsurface
中面的描述最有效
Plate element model is effective
various parameters:
横向部分：对各种变量非常敏感
Joint geometry and restraint
几何接头和约束
Welding procedures
焊接过程
Plate thicknesses and number of
passes
平板厚度和焊缝数量
In-Complete Measurements - A Carbon SteelPipe Girth
强约束条件
Strong 3D residual stress features
强3D残余应力特征
Often requiring a 3D model
通常需要3D模型
A Boiler Shell Temper Bead Repair Weld
炉壳回火焊道补焊
Measurements and Model Validations Transverse Residual Stresses 测量和模型验证-横向残余应力
壳单元模型是有效的
Challenges for measurements
检测的难题
Surface effects
表面效应
Through-thickness effects
厚度影响
Steel Mill B
钢厂B
Repair Welds
补焊
Highly restrained conditions
3D残余应力特征和OD的发展
3D Residual Stress Characteristics in a Multi-Pass Girth Weld
多道环焊中3D残余应力的特征
Example: SS Pipe Girth Weld
举例：SS管环形焊
Understanding the Need in a Specific Application is Important
Weld in an Earlier MPC Report
非完整测量—在早期MPC报告中的碳钢管环焊
Carbon Steel Lap Fillet Joint – An Example with Full Field Measurements
碳钢搭接角焊接头—全域测量的例子
Example: A VPPA Butt Weld in Al-Li Alloy(2195) Panel
Tension: Initial Weld v.s. Repair
在拉力作用下残余应力对应变分布的影响初始焊接与补焊对比
预测
实测
Effects of Repair Weld Planishing on Strain
Distributions - Tension Loading
补焊碾压对应变分布的影响-拉伸载荷
欧洲TRAINSS的模拟焊接和测量数据
Prediction versus Measurements – TRAINSS
Mock Up Weld
预测与测量-TRAINSS模拟焊接
Inter-pass temp. = 25C ( assumed)
层间 温度=25C(假设）
Inter-pass temp. = 200C
Through Wall Distributions at Weld Center
焊缝中心处沿厚度方向的应力分布
Across the Weld at Weld Center
穿过焊缝中心的应力分布
Mock Up Weld and Measurement Data from European TRAINSS Project
层间 温度wenku.baidu.com200C
A Butt Joint in a Thin Sheet – FE Simulation Using
a Special Shell Model (2-Pass Weld)
薄板对接-使用特殊壳模型的有限元模拟（2道焊）
Residual Stress Distributions After Weld Repair
补焊后残余应力分布
A Thermal Stretching Technique for Mitigating Repair
Weld Residual Stresses
控制补焊后的残余应力的热拉伸技术
Residual Stress Effects on Strain Distributions under
举例：铝锂合金板（2195）上的VPPA对接焊缝
Full Field Residual Stress Distributions are Required for Appropriate Interpretation
全域残余应力分布的适当解释
3D Residual Stress Features and Development -OD
Distributions - sqrt(rt)
表面长尺度残余应力分布-sqrt(rt)
Longitudinal versus Transverse Residual Stresses
纵向与横向残余应力对比
Longitudinal component 纵向部分
图例—平板对接焊缝
Yield magnitude tension within or near weld
焊缝内或附近产生巨大拉力
Dying out rapidly and become compression
away from weld
在远离焊缝处迅速衰减且变成压力
Transverse component: very sensitive to
Transverse Component in Repair Weld Strongly
Depends on Repair Dimensions
补焊的横向分量主要取决于修复尺寸
理解特殊应用需求的重要性
Cutting accuracy control
精确控制切割
Long range residual stress is of interest
注意大范围内的残余应力
Best described at the midsurface
中面的描述最有效
Plate element model is effective
various parameters:
横向部分：对各种变量非常敏感
Joint geometry and restraint
几何接头和约束
Welding procedures
焊接过程
Plate thicknesses and number of
passes
平板厚度和焊缝数量
In-Complete Measurements - A Carbon SteelPipe Girth
强约束条件
Strong 3D residual stress features
强3D残余应力特征
Often requiring a 3D model
通常需要3D模型
A Boiler Shell Temper Bead Repair Weld
炉壳回火焊道补焊
Measurements and Model Validations Transverse Residual Stresses 测量和模型验证-横向残余应力
壳单元模型是有效的
Challenges for measurements
检测的难题
Surface effects
表面效应
Through-thickness effects
厚度影响
Steel Mill B
钢厂B
Repair Welds
补焊
Highly restrained conditions
3D残余应力特征和OD的发展
3D Residual Stress Characteristics in a Multi-Pass Girth Weld
多道环焊中3D残余应力的特征
Example: SS Pipe Girth Weld
举例：SS管环形焊
Understanding the Need in a Specific Application is Important
Weld in an Earlier MPC Report
非完整测量—在早期MPC报告中的碳钢管环焊
Carbon Steel Lap Fillet Joint – An Example with Full Field Measurements
碳钢搭接角焊接头—全域测量的例子
Example: A VPPA Butt Weld in Al-Li Alloy(2195) Panel
Tension: Initial Weld v.s. Repair
在拉力作用下残余应力对应变分布的影响初始焊接与补焊对比
预测
实测
Effects of Repair Weld Planishing on Strain
Distributions - Tension Loading
补焊碾压对应变分布的影响-拉伸载荷
欧洲TRAINSS的模拟焊接和测量数据
Prediction versus Measurements – TRAINSS
Mock Up Weld
预测与测量-TRAINSS模拟焊接
Inter-pass temp. = 25C ( assumed)
层间 温度=25C(假设）
Inter-pass temp. = 200C
Through Wall Distributions at Weld Center
焊缝中心处沿厚度方向的应力分布
Across the Weld at Weld Center
穿过焊缝中心的应力分布
Mock Up Weld and Measurement Data from European TRAINSS Project
层间 温度wenku.baidu.com200C
A Butt Joint in a Thin Sheet – FE Simulation Using
a Special Shell Model (2-Pass Weld)
薄板对接-使用特殊壳模型的有限元模拟（2道焊）
Residual Stress Distributions After Weld Repair
补焊后残余应力分布
A Thermal Stretching Technique for Mitigating Repair
Weld Residual Stresses
控制补焊后的残余应力的热拉伸技术
Residual Stress Effects on Strain Distributions under
举例：铝锂合金板（2195）上的VPPA对接焊缝
Full Field Residual Stress Distributions are Required for Appropriate Interpretation
全域残余应力分布的适当解释
3D Residual Stress Features and Development -OD