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curvature space 1

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Fatigue crack growth behavior of a 170 mm diameter stainless steel straight pipe subjected to combined torsion

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 4, Pages 905-913 doi: 10.1007/s11709-021-0683-2

Abstract: In a nuclear powerplant, the rotary equipment, such as a pump directly fitted with hanger in the piping system, experiences torsional and bending loads. Higher crack growth rate occurs because of this torsional load in addition to the bending load. Hence, it is necessary to study the fatigue behavior of piping components under the influence of combined torsional and bending load. In this study, experimental fatigue life evaluation was conducted on a notched stainless steel SA312 Type 304LN straight pipe having an outer diameter of 170 mm. The experimental crack depth was measured using alternating current potential drop technique. The fatigue life of the stainless steel straight pipe was predicted using experiments, Delale and Erdogan method, and area-averaged root mean square–stress intensity factor approach at the deepest and surface points of the notch. Afterward, the fatigue crack growth and crack pattern were discussed. As a result, fatigue crack growth predicted using analytical methods are in good agreement with experimental results.

Keywords： fatigue life Delale and Erdogan method RMS–SIF approach stainless steel torsion and bending load

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A compound load simulator based on zero-torsion parallel mechanisms

Jingjun YU, Wei LI, Xu PEI, Shusheng BI, Guanghua ZONG

Frontiers of Mechanical Engineering 2012, Volume 7, Issue 1, Pages 1-4 doi: 10.1007/s11465-012-0306-7

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Waves of Probability and the Problems of Torsion for Quantum Effect

OuYang Shoucheng,Li Zhilan,Yuan Dongsheng

Strategic Study of CAE 2005, Volume 7, Issue 6, Pages 1-6

Abstract: a result of comprehensive interactions among intensity of potential field and particle density and torsion

Keywords： torsion (spin) probability quantum effect nonlinear instability curvature space

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Torsional behavior of triangular web profile (TRIWP) steel section by experimental study

Fatimah DE’NAN,Hazwani HASAN,Mohd Hanim OSMAN,Sariffudin SAAD

Frontiers of Structural and Civil Engineering 2016, Volume 10, Issue 4, Pages 409-419 doi: 10.1007/s11709-016-0358-6

Abstract: The findings were shown that the TriWP steel sections had better resistance against torsion in comparison

Keywords： corrugated web i-beam non uniform steel section torsion resistance torsion angle triangular web profile

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The zero-point energy of vibration and the Casimir force

Huang Zhixun

Strategic Study of CAE 2008, Volume 10, Issue 5, Pages 63-69

Abstract: of anomalous phenomena in nature or at laboratories could be explained by the Casimir effect and the torsion

Keywords： zero-point energy zero-point field energy of vacuum Casimir force theory of torsion field

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Research of 1 770 MPa galvanized steel wire for stay cable of domestic bridges

Ding Feng,Sang Chunming,Zhou Daiyi,Bai Bingdong

Strategic Study of CAE 2009, Volume 11, Issue 3, Pages 57-64

Abstract: the 1 770 MPa galvanized wire used for stay cable, which has high strength, low relaxation and good torsion

Keywords： galvanized steel wire torsion double tension limiter die gravel wiping

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Formation Process and Mechanical Deformation Behavior of a Novel Laser-Printed Compression-Induced Twisting-Compliant Mechanism Article

Jie Gao, Dongdong Gu, Chenglong Ma, Donghua Dai, Lixia Xi, Kaijie Lin, Tong Gao, Jihong Zhu, Yuexin Du

Engineering 2022, Volume 15, Issue 8, Pages 133-142 doi: 10.1016/j.eng.2021.03.032

Abstract:

A novel compression-induced twisting (CIT)-compliant mechanism was designed based on the freedom and constraint topology (FACT) method and manufactured by means of laser powder bed fusion (LPBF). The effects of LPBF printing parameters on the formability and compressive properties of the laserprinted CIT-compliant mechanism were studied. Within the range of optimized laser powers from 375 to 450 W and with the densification level of the samples maintained at above 98%, changes in the obtained relative densities of the LPBF-fabricated CIT-compliant mechanism with the applied laser powers were not apparent. Increased laser power led to the elimination of residual metallurgical pores within the inclined struts of the CIT mechanism. The highest dimensional accuracy of 0.2% and the lowest surface roughness of 20 μm were achieved at a laser power of 450 W. The deformation behavior of the CIT-compliant mechanism fabricated by means of LPBF exhibited four typical stages: an elastic stage, a heterogeneous plastic deformation stage, a strength-destroying stage, and a deformation-destroying stage (or instable deformation stage). The accumulated compressive strain of the optimally printed CIT mechanism using a laser power of 450 W went up to 20% before fracturing, demonstrating a large deformation capacity. The twisting behavior and mechanical properties were investigated via a combination of finite-element simulation and experimental verification. An approximately linear relationship between the axial compressive strain and rotation angle was achieved before the strain reached 15% for the LPBF-processed CIT-compliant mechanism.

Keywords： 3D printing Laser powder bed fusion Compression-induced twisting-compliant mechanism Compression–torsion