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13
CONTENT
论文背景及意义
The background and significance
5
CONTENT
论文背景及意义
The background and significance
论文综述
The Paper reviews
研究方法
The research methods
论题总结
The summary
6
Test principle
Hole-drilling method
图一
论文综述
The Paper reviews
图二
7
论文综述
The Paper reviews
8
Nominal specimen dimensions
论文综述
The Paper reviews
图三
9
图四
论文综述
The Paper reviews
图五
10
ቤተ መጻሕፍቲ ባይዱ
表一
论文综述
The Paper reviews
11
amount which was determined using elastic method. Namely, the real stress values (σ) equals the measured stress values after the tube is stripped (σ′) plus the correction amount (Δσ)。
2
C O N TE N T
论文背景及意义
The background and significance
论文综述
The Paper reviews
研究方法
The research methods
论题总结
The summary
3
CONTENT
论文背景及意义
The background and significance
论文综述
The Paper reviews
研究方法
The research methods
论题总结
The summary
4
选题背景及意义
选题背景及意义
The background and significance
Square hollow sections are formed using two different forming processes of a “direct square” way and an “indirect way from circular to square”. Two test methods of the hole-drilling method and the Xray diffraction method are used to measure the magnitudes and distributions of longitudinal residual stresses. The magnitudes and distributions of longitudinal residual stresses along the section perimeter as well as along the section thickness are obtained in this study. It is shown that the longitudinal residual stresses are in tension at outer surface and in compression at inner surface, and present nonlinear distributions, which seems like “sine” curve along the section thickness. Furthermore, the effects of forming process and cross-section geometry on the magnitudes and distributions of longitudinal residual stresses for cold formed thick-walled square hollow sections are discussed. At last, two distribution patterns have been proposed for the square hollow sections formed using two different forming processes, respectively.
论文综述
The Paper reviews
Determination of residual stress distribution along thickness The measured values of the stresses inside the section need to be corrected by the
文献阅读报告
The Papers Reading Report PPT Templates
汇报人：张涛
1
本周阅读文献
本周阅读文献
The Papers You Read This Week
（一）英文文献
[1] Lewei Tong. Experimental investigation on longitudinal residual stresses for cold-formed thick-walled square hollow sections[J]. Tongji University,2012.
• thick-walled circular hollow sections
12
• thick-walled flat plates
论文综述
The Paper reviews
The equations for thick-walled circular hollow sections and thick walled flat plates shall be used for the corner parts and flat parts of the square hollow sections, respectively.
CONTENT
论文背景及意义
The background and significance
5
CONTENT
论文背景及意义
The background and significance
论文综述
The Paper reviews
研究方法
The research methods
论题总结
The summary
6
Test principle
Hole-drilling method
图一
论文综述
The Paper reviews
图二
7
论文综述
The Paper reviews
8
Nominal specimen dimensions
论文综述
The Paper reviews
图三
9
图四
论文综述
The Paper reviews
图五
10
ቤተ መጻሕፍቲ ባይዱ
表一
论文综述
The Paper reviews
11
amount which was determined using elastic method. Namely, the real stress values (σ) equals the measured stress values after the tube is stripped (σ′) plus the correction amount (Δσ)。
2
C O N TE N T
论文背景及意义
The background and significance
论文综述
The Paper reviews
研究方法
The research methods
论题总结
The summary
3
CONTENT
论文背景及意义
The background and significance
论文综述
The Paper reviews
研究方法
The research methods
论题总结
The summary
4
选题背景及意义
选题背景及意义
The background and significance
Square hollow sections are formed using two different forming processes of a “direct square” way and an “indirect way from circular to square”. Two test methods of the hole-drilling method and the Xray diffraction method are used to measure the magnitudes and distributions of longitudinal residual stresses. The magnitudes and distributions of longitudinal residual stresses along the section perimeter as well as along the section thickness are obtained in this study. It is shown that the longitudinal residual stresses are in tension at outer surface and in compression at inner surface, and present nonlinear distributions, which seems like “sine” curve along the section thickness. Furthermore, the effects of forming process and cross-section geometry on the magnitudes and distributions of longitudinal residual stresses for cold formed thick-walled square hollow sections are discussed. At last, two distribution patterns have been proposed for the square hollow sections formed using two different forming processes, respectively.
论文综述
The Paper reviews
Determination of residual stress distribution along thickness The measured values of the stresses inside the section need to be corrected by the
文献阅读报告
The Papers Reading Report PPT Templates
汇报人：张涛
1
本周阅读文献
本周阅读文献
The Papers You Read This Week
（一）英文文献
[1] Lewei Tong. Experimental investigation on longitudinal residual stresses for cold-formed thick-walled square hollow sections[J]. Tongji University,2012.
• thick-walled circular hollow sections
12
• thick-walled flat plates
论文综述
The Paper reviews
The equations for thick-walled circular hollow sections and thick walled flat plates shall be used for the corner parts and flat parts of the square hollow sections, respectively.