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Author

  • Staat, Manfred (10)
  • Vu, Duc Khoi (9)
  • Tran, Thanh Ngoc (3)
  • Pham, Phu Tinh (2)
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  • Khoi, Vu Duc (1)
  • Kreißig, R. (1)
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A primal-dual algorithm for shakedown analysis of elastic-plastic bounded linearly kinematic hardening bodies (2010)
Pham, Phu Tinh ; Vu, Duc Khoi ; Tran, Thanh Ngoc ; Staat, Manfred
Limit Analysis of Defects (2000)
Staat, Manfred ; Heitzer, M. ; Yan, Ai-Min ; Khoi, Vu Duc ; Nguyen, Dang Hung ; Valdoire, F. ; Lahousse, A.
An algorithm for shakedown analysis for materials with temperature dependent yield stress (2004)
Staat, Manfred ; Vu, Duc Khoi
This work is an attempt to answer the question: How to use convex programming in shakedown analysis of structures made of materials with temperature-dependent properties. Based on recently established shakedown theorems and formulations, a dual relationship between upper and lower bounds of the shakedown limit load is found, an algorithmfor shakedown analysis is proposed. While the original problem is neither convex nor concave, the algorithm presented here has the advantage of employing convex programming tools.
Limit analysis of flaws in pressurized pipes and cylindrical vessels Part II: Circumferential defects (2012)
Staat, Manfred ; Vu, Duc Khoi
Upper and lower bound theorems of limit analyses have been presented in part I of the paper. Part II starts with the finite element discretization of these theorems and demonstrates how both can be combined in a primal–dual optimization problem. This recently proposed numerical method is used to guide the development of a new class of closed-form limit loads for circumferential defects, which show that only large defects contribute to plastic collapse with a rapid loss of strength with increasing crack sizes. The formulae are compared with primal–dual FEM limit analyses and with burst tests. Even closer predictions are obtained with iterative limit load solutions for the von Mises yield function and for the Tresca yield function. Pressure loading of the faces of interior cracks in thick pipes reduces the collapse load of circumferential defects more than for axial flaws. Axial defects have been treated in part I of the paper.
Upper bound limit and shakedown analysis of shells using the exact Ilyushin yield surface (2008)
Tran, Thanh Ngoc ; Kreißig, R. ; Vu, Duc Khoi ; Staat, Manfred
Limit analysis of flaws in pressurized pipes and cylindrical vessels. Part I: Axial defects (2007)
Staat, Manfred ; Vu, Duc Khoi
Analysis of pressure equipment by application of the primal-dual theory of shakedown (2007)
Vu, Duc Khoi ; Staat, Manfred ; Tran, Ich Thinh
Shakedown analysis of structures made of materials with temperature-dependent yield stress (2007)
Vu, Duc Khoi ; Staat, Manfred
Reliability Analysis of Inelastic Shell Structures Under Variable Loads (2009)
Tran, Thanh Ngoc ; Pham, Phu Tinh ; Vu, Duc Khoi ; Staat, Manfred
Limit loads of circumferentially flawed pipes and cylindrical vessels under internal pressure (2006)
Staat, Manfred ; Vu, Duc Khoi
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