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In memorial of Tsien Hsue-Shen's 100 th anniversary Engineering sciences and applied mechanics (part 2)------in memorial of Tsien Hsue-Shen's 100 th anniversary

Che-Min Cheng

2012, 42(1): 1-3. doi: 10.6052/1000-0992-2012-1-lxjzJ2012-006

Abstract(1688)

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Advances in transfer matrix method for multibody system dynamics

2012, 42(1): 4-17. doi: 10.6052/1000-0992-2012-1-lxjzJ2011-104

Abstract(2487)

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As a new method of multibody system dynamics, the transfer matrix method of multibody system has the following characteristics: without the global dynamics equation of system, low order of matrix involved, high efficiency. It has been widely used in the dynamic design of many complex mechanical systems, such as multiple launch rocket system, self-propelled artillery system, and warship gun system. In this paper, the advances in transfer matrix method of multibody system, including linear transfer matrix method of multibody system, discrete time transfer matrix method of multibody system, transfer matrix method of two-dimension system, transfer matrix method of controlled multibody system, and the mixed method of transfer matrix method of multibody system and ordinary dynamics methods, are presented. Some engineering applications of this method on self-propelled artillery system and multiple launch rocket system are also given.

RESEARCH PROGRESS IN GENERALIZED THERMOELASTIC PROBLEMS

Xiaogeng Tian, Shen Yapeng

2012, 42(1): 18-28. doi: 10.6052/1000-0992-2012-1-lxjzJ2011-115

Abstract(1762)

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The advance in generalized thermoelasticity near recent 10 years is summarized in this paper. It includes the development of different generalized thermoelastic theories and the related expanded theories, such as generalized thermo-piezoelectric theory, generalized thermoelastic diffusion theory, generalized thermoviscoelastic theory. The solving methods of generalized thermoelastic problems are also summarized. It provides a comprehensive understanding of generalized thermoelasticity and its trends. We wish it can help researchers who are engaged in generalized thermoelasticity study.

RESEARCH STATUS AND PROGRESS IN FRACTURE ASSESSMENT OF PIPELINE UNDER THE CONDITION OF LARGE-SCALE YIELDING

2012, 42(1): 29-40. doi: 10.6052/1000-0992-2012-1-lxjzJ2011-110

Abstract(2051)

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With the application of high-strength and high-toughness pipeline steel, relevant fracture assessment is needed for pipeline under large-scale yielding condition. This article summarizes limitations that govern the conventional fracture mechanics when applied to the fracture assessment of pipeline under the condition of large-scale yielding. Here, progresses in pipeline fracture assessment under the condition of large-scale yielding are presented in detailed in four main aspects: two-parameter fracture mechanics, constraint-corrected fracture toughness test, strain-based fracture assessment, and strain-based failure assessment diagram. First of all, two methods for constraint-corrected fracture toughness test are discussed, which is SENT specimen and apparent fracture toughness method. The research status and existing problem are reviewed for constraint-corrected fracture toughness test based on SENT specimen. The basic principles of strain-based fracture assessment are presented. The strain-based driving force equation and the CTOD failure criteria are introduced in the method of strain-based fracture assessment. Finally, an overview is given for the strain-based J-integral estimation and strain-based failure assessment diagram. Finally, key topics for further studies are pointed out.

PROCESSES IN THE STUDY ON NOVEL COMPOSITE SANDWICH PANELS WITH LATTICE TRUSS CORES

Linzhi Wu, Jian Xiong, Li Ma, Bing Wang, Guoqi Zhang, Jinshui Yang

2012, 42(1): 41-67. doi: 10.6052/1000-0992-2012-1-lxjzJ2011-095

Abstract(2718)

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Composite lattice truss structures are new type materials with many advantages such as lightweight, high specific stiffness, specific strength and multifunctional applications, leading to heightened concerns among researchers at home and abroad. Composite lattice truss structure is one of the new material structures having the best foreground in the world. This article presents a comprehensive review on novel composite sandwich panels with lattice truss cores, including studies on topology design, fabrication method, mechanical properties, failure mechanism and analytical models. Mechanical properties, failure mechanism and prediction models are studied for composite sandwich panels with lattice truss cores. Especially, the modified strength-density charts are provided in the present paper. Potential applications of composite sandwich panels with lattice truss cores are summarized and development tendency of composite lattice truss structures is pointed out.

Review on development and experimental validation for anisotropic yield criterions

Feifei Zhang, Jieshi Chen, Jun Chen, Xiaozhong Huang, Jian Lu

2012, 42(1): 68-80. doi: 10.6052/1000-0992-2012-1-lxjzJ2011-125

Abstract(2109)

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Due to the importance of material's yield behavior in sheet metal forming, the anisotropic yield criterions have been studied extensively. In this paper, a comprehensive review on the development of the anisotropic yield criterions is presented, the three types of yield criterions- Hill series, Hosford series and Drucker series, are generalized separately. The applicability and limitation for each criterion are highlighted, and some different methods of experimental validation are summarized, finally some difficult issues on the application of anisotropic yield criterions during the numerical simulation of sheet metal forming and future research direction are pointed out.

The development of the piv experimental study of the super/hypersoinc flowfield

2012, 42(1): 81-90. doi: 10.6052/1000-0992-2012-1-lxjzJ2010-126

Abstract(2393)

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The special requirement for the measurement of the supersonic flowfield is analysized, and the major difficult and the corresponding solution about using the art PIV technique in the measurement of the super/hypersonic flowfield is concluded. The analysis is mainly focused on the major requirement on the trace particle, the characteristics of the particle and the different method to put it in the flowfield. Finally the recent development of the PIV measurement of the super/hypersonic flowfield is introduced and summarized, mainly focused on the PIV measurement of the hypersonic shock wave/boundary layer interactions in the hypersonic flow and the PIV measurement of the internal flowfield of the key components of the scramjet propulsion system. The result provided the useful information for the relative researchers.