Results 221 to 230 of about 109,321 (266)

Study on the Viscoelastic Damage Properties of NEPE Solid Propellant with Different Cyclic Stress Ratios

Propellants, Explosives, Pyrotechnics, 2022
AbstractViscoelastic damage properties of NEPE (Nitrate Ester Plasticized Polyether) solid propellant have been studied in this work. This work focuses on the creep and fatigue damage evolution. Cyclic loading tests for NEPE solid propellants are conducted with different stress ratios.
Qinwei Hu, Qin‐Zhi Fang, Baolin Sha, Li Jin   +3 more
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Stress ratio effect on cyclic debonding in adhesively bonded composite joints

Composite Structures, 1987
A study was conducted to investigate the stress ratio effect on cyclic debond growth behavior in adhesively bonded composite joints. The system studied consisted of graphite/epoxy adherends bonded with a toughened epoxy adhesive. This study showed that the strain energy release rate range was the driving factor for cyclic debonding of the tested bonded
S. Mall, G. Ramamurthy, M.A. Rezaizdeh
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Cyclic strength of loose anisotropically-consolidated calcareous sand under standing waves and assessment using the unified cyclic stress ratio

Engineering Geology, 2021
Abstract Progressive and standing waves can produce instability of the seabed and seabed-supported marine structures. In this paper, the stress paths induced by standing waves were deduced to provide a theoretical basis for laboratory element tests to establish the cyclic behavior of marine sediments, which can serve to improve the understanding of ...
Xiaozhi Zhou, Armin W. Stuedlein, Yumin Chen, Hanlong Liu   +3 more
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Effect of Compaction Ratio, Frequency, Stress Amplitude and Cyclic Stress Ratio on the Dynamic Characteristic of Sea Sand Material under Vehicle Loading

2021
The Geotechnical Engineering Journal of the SEAGS & AGSSEA, 52, 1, 26 ...
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Critical cyclic stress ratio of undisturbed saturated soft clay in the yangtze estuary under complex stress conditions

Transactions of Tianjin University, 2010
There exists a critical cyclic stress ratio when sand or clay is subjected to cyclic loading. It is an index distinguishing stable state or failure state. The soil static and dynamic universal triaxial and torsional shear apparatus developed by Dalian University of Technology in China was employed to perform different types of tests on saturated soft ...
Gongxun Liu, Maotian Luan, Xiaowei Tang, Zhongtao Wang, Ying Guo   +4 more
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Nonlinear shear mass participation factor (rd) for cyclic shear stress ratio evaluation

Soil Dynamics and Earthquake Engineering, 2004
Most methods for assessment of in situ seismic soil liquefaction potential require evaluation of the earthquake-induced cyclic shear stress ratio (CSR). Estimates of the in situ CSR can be developed directly, using dynamic response analyses, but it is common in ‘simplified’ analysis methods to develop estimates of the in situ CSR using empirical ...
K.Onder Cetin, Raymond B. Seed
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Test and DEM Analysis of Cyclic Vertical Stress Ratio and Torsional Stress Ratio on the Dynamic Shear Characteristics of Rubber Sand

International Journal for Numerical and Analytical Methods in Geomechanics
ABSTRACT In order to investigate the dynamic shear characteristics of rubber sand under cyclic loading, a series of cyclic torsional shear tests was conducted using a hollow cylinder torsional shear apparatus. The effects of four cyclic vertical stress ratios (CVSRs = 0.15, 0.25, 0.35, and 0.45) and four cyclic ...
Qingqing Qu, Muhan Li, Feiyu Liu, Chenbo Gao, Xingmin Zheng   +4 more
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The influence of stress ratio of cyclic loading on properties and mechanism of nitinol fracture

Physicochemical Mechanics of Materials
The shape memory alloy (nitinol) was studied under low-cycle fatigue at a frequency of 0.5 Hz, different levels of maximum stresses σmax and stress ratio R (0.1 and 0.5) in the loading cycle. It was shown that regardless of the level of σmax, the energy dissipated during deformation of nitinol at R = 0.1 always exceeded that inherent to it at R = 0.5 ...
V. P. Iasnii, H. V. Krechkovska, N. Z. Bykiv, O. Z. Student, R. S. Lubianytskyi   +4 more
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Modeling of fatigue crack growth closure considering the integrative effect of cyclic stress ratio, specimen thickness and Poisson’s ratio

Chinese Journal of Mechanical Engineering, 2012
Key components of large structures in aeronautics industry are required to be made light and have long enough fatigue lives. It is of vital importance to estimate the fatigue life of these structures accurately. Since the FCG process is affected by various factors, no universal model exists due to the complexity of the mechanisms.
Jiantao Liu, Pingan Du, Xiaobao Liu, Qiang Du   +3 more
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Dense Granular Columns in Liquefiable Ground. I: Shear Reinforcement and Cyclic Stress Ratio Reduction

Journal of Geotechnical and Geoenvironmental Engineering, 2016
AbstractThe installation of dense granular columns by various construction techniques can be used to mitigate liquefaction through a combination of densification, increase of lateral stresses, reinforcement, and drainage. The contributing mechanism of shear reinforcement is isolated and explored using nonlinear three-dimensional (3D) finite-element (FE)
Deepak Rayamajhi, Scott A. Ashford, Ross W. Boulanger, Ahmed Elgamal   +3 more
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