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ON THE STRESS CONCENTRATION IN THICK CYLINDRICAL SHELLS WITH AN ARBITRARY cutout

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Applied Mathematics and Mechanics(English Edition) 1998年第5期19卷 399-410页

作者：胡超刘殿魁马兴端王本利 Harbin Institute of Technology 15001 Harbin P. R. China

In this paper, based on the theory of thick shells including effects of transverse shear deformations, a complex variables analytic method to solve stress concentrations in circular cylindrical shells with a small cutout is established A general solution and expression satisfying the boundary conditions on the edge of arbitrary cutouts are obtained. The stress problem can be reduced to the solution of an infinite algebraic equation series, and can be normalized by means of this method. Numerical results for stress concentration factors of the shell with a small circular and elliptic cutout are presented.

关键词： thick cylindrical shell cutout stress concentration complex variable method and conformal mapping

DYNAMIC STRESS CONCENTRATIONS IN AMBARTSUMIAN'S PLATE WITH A cutout

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Acta Mechanica Solida Sinica 1998年第4期11卷 341-350页

作者： Hu Chao Zhao Xinghua (Institute of Applied Mathematics and Mechanics,Shanghai University,Shanghai 200072,China)Ma Xingrui Huang Wenhu (Harbin Institute of Technology,Harbin 150001,China) Shanghai Univ Inst Appl Math & Mech Shanghai 200072 Peoples R China Harbin Inst Technol Harbin 150001 Peoples R China

Based on the motion equations of flexural wave in Ambartsumian' s plates including the effects of transverse shear deformations,by using perturbation method of small parameter,the scatter- ing of flexural waves and dynamic stress concentrations in the plate with a cutout have been studied. The asypmtotic solution of the dynamic stress problem is *** results for the dynamic stress concentration factor in Ambartsumian's plates with a circular cutout are graphically presented and discussed.

关键词： Ambartsumian's plate cutout dynamic stress concentration perturbation method

The Effect of cutout on Natural Frequencies of Thin Plate

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Journal of Beijing Institute of Technology 1996年第1期5卷 7-12页

作者：杨国树北京理工大学应用力学系

The laws that natural frequencies of rectangular plate with a cutout will change with size and position of cutout are obtained by analytic, numerical and experimental methods.

关键词： vibrational frequency thin plate cutout

Experimental and numerical investigation of buckling in rectangular steel plates with groove-shaped cutouts

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2012年第6期13卷 469-480页

作者： Y. Faradjian MOHTARAM J. Taheri KAHNAMOUEI M. SHARIATI B. BEHJAT Mechanical Department Islamic Azad University Bostan Abad Branch Iran Mechanical Department Shahrood University of Technology Shahrood Iran Mechanical Department Sahand University of Technology Tabriz Iran

Steel plates are widely used in various structures, such as the deck and bodies of ships and bridges, and in the aerospace industry. In many instances, these plates are subjected to axial compression loads that predispose the sheets to instability and buckling. In this study, we investigate the buckling and post-buckling behaviors of steel plates having groove-shaped cutouts of various dimensions and angles using finite element method (FEM) (by ABAQUS software) and experimental tests (by an Instron servohydraulic machine). Boundary conditions were clamped by supports at upper and lower ends and free supports at the other edges. The results of both numerical and experimental analyses are compared, which show a very good agreement between them. Finally, based on the experimental findings, formulas are presented for the determination of the buckling load of such plates.

关键词： Buckling Steel plates cutout Experimental analysis Finite element method (FEM)

Does proximal femoral nail antirotation achieve better outcome than previous-generation proximal femoral nail?

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World Journal of Orthopedics 2020年第11期11卷 483-491页

作者： Seung-Hoon Baek Seunggil Baek Heejae Won Jee-Wook Yoon Chul-Hee Jung Shin-Yoon Kim Department of Orthopedic Surgery Kyungpook National University HospitalDaegu 41944South Korea Department of Orthopedic Surgery School of MedicineKyungpook National UniversityDaegu 41944South Korea Department of Orthopedic Surgery Goodssen HospitalDaegu 42010South Korea

BACKGROUND There are few studies in the literature comparing the clinical outcomes and radiographic results of proximal femoral nail(PFN)and proximal femoral nail antirotation(PFNA)for pertrochanteric femoral fracture(PFF)in elderly *** To evaluate both clinical and radiographic outcomes after fixation with PFN and PFNA in an elderly patient *** One hundred fifty-eight patients older than 65 years with PFF who underwent fixation with either PFN or PFNA were ***-three patients underwent fixation with PFN,whereas 85 were fixed with *** mean follow-up was 2.4 years(range,1-7 years).Clinical outcome was measured in terms of operation time,postoperative function at each follow-up visit,and mortality within one *** evaluation included reduction quality after surgery,Cleveland Index,tip-apex distance(TAD),union rate,time to union,and sliding distance of the screw or *** including nonunion,screw cutout,infection,osteonecrosis of the femoral head,and implant breakage were also *** Postoperative function was more satisfactory in patients who underwent PFNA than in those who underwent PFN(P=0.033).Radiologically,the sliding difference was greater in PFN than in PFNA patients(6.1 and 3.2 mm,respectively,P=0.036).The rate of screw cutout was higher in the PFN group;eight for PFN(11.0%)and two for PFNA patients(2.4%,P=0.027).There were no differences between the two groups in terms of operation time,mortality rate at one year after the operation,adequacy of reduction,Cleveland Index,TAD,union rate,time to union,nonunion,infection,osteonecrosis,or implant *** Elderly patients with PFF who underwent PFNA using a helical blade demonstrated better clinical and radiographic outcomes as measured by clinical score and sliding distance compared with patients who underwent PFN.

关键词： Pertrochanteric fracture Proximal femoral nail Proximal femoral nail antirotation Sliding distance cutout Outcome