Anisotropic fracture and energy characteristics of a Tibet marble exposed to multi-level constant-amplitude (MLCA) cyclic loads: A lab-scale testing

2021 ◽  
Vol 244 ◽  
pp. 107550
Author(s):  
Y. Wang ◽  
Y.F. Yi ◽  
C.H. Li ◽  
J.Q. Han
Keyword(s):  
Cyclic Loads ◽  
Constant Amplitude ◽  
Energy Characteristics ◽  
Anisotropic Fracture ◽  
Multi Level ◽  
Level Constant

Deformation characteristics and failure modes of sandstones under discontinuous multi-level cyclic loads

2020 ◽  
Vol 373 ◽  
pp. 599-613 ◽  
Author(s):  
Kang Peng ◽  
Jiaqi Zhou ◽  
Quanle Zou ◽  
Yongjiang Zhang ◽  
Guowen Tan
Keyword(s):  
Failure Modes ◽  
Cyclic Loads ◽  
Deformation Characteristics ◽  
Multi Level

Seismic Performance for Low Strength Row-Lock Cavity Masonry Reinforced with HPFL

2011 ◽  
Vol 243-249 ◽  
pp. 779-786
Author(s):  
Shou Ping Shang ◽  
Mei Fang Xu ◽  
Chao Qun Ji
Keyword(s):  
Seismic Behavior ◽  
High Performance ◽  
Energy Intensity ◽  
Low Frequency ◽  
Cyclic Loads ◽  
Vertical Load ◽  
Constant Amplitude ◽  
Comparison And Analysis ◽  
Low Strength ◽  
Reinforcement Design

In order to investigate the failure mechanism,failure mode and hysteresis curves of the low strength row-lock cavity walls strengthened with HPFL(High Performance Ferrocement Laminate), eight pieces of rowlock cavity walls subjected to low-frequency cyclic loads and a constant-amplitude vertical load on top were tested, and the results showed that the bearing capacity, ductility and energy intensity all were greatly improved on the basis of comparison and analysis of the seismic behavior influenced by different strengthening methods. In addition, this article proposed the calculation formulas for reinforcement design reference .

Fatigue properties of RPC under cyclic loads of single-stage and multi-level amplitude

2010 ◽  
Vol 25 (1) ◽  
pp. 167-173 ◽  
Author(s):  
Mingzhe An ◽  
Ziruo Yu ◽  
Meili Sun ◽  
Shuaiquan Zheng ◽  
Lei Liang
Keyword(s):  
Single Stage ◽  
Fatigue Properties ◽  
Cyclic Loads ◽  
Multi Level

Fatigue-Crack-Propagation Rates Under Random Excitation

1967 ◽  
Vol 89 (1) ◽  
pp. 55-68 ◽  
Author(s):  
R. Plunkett ◽  
N. Viswanathan
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Crack Propagation Rate ◽  
Propagation Rate ◽  
Random Excitation ◽  
Cantilever Beams ◽  
Constant Amplitude ◽  
Stress Cycles ◽  
Level Constant

Fatigue-crack-propagation rates have been measured for 2024-T3 aluminum cantilever beams in reversed bending under constant amplitude, two-level constant amplitude, and random excitations. For the two-level tests there is a large interaction between the crack-propagation rates caused by stress cycles of different amplitudes. The high-low sequence gives a delay and the low-high sequence a higher rate than a simple no interaction assumption would predict. This is confirmed in the random-excitation tests where the crack-propagation rate for low damping is much higher than that for high damping for exactly the same distribution and level of stress peaks.

scholarly journals Fatigue Characteristic of Designed T-Type Specimen under Two-Step Repeating Variable Amplitude Load with Low-Amplitude Load below the Fatigue Limit

2021 ◽  
Vol 9 (2) ◽  
pp. 107
Author(s):  
Jin Gan ◽  
Di Sun ◽  
Hui Deng ◽  
Zhou Wang ◽  
Xiaoli Wang ◽  
...  
Keyword(s):  
Stress Ratio ◽  
Type Specimen ◽  
Fatigue Tests ◽  
Cumulative Damage ◽  
Cyclic Loads ◽  
Constant Amplitude ◽  
Type Specimens ◽  
Variable Amplitude ◽  
Non Linear ◽  
Low Amplitude

In order to investigate the non-linear fatigue cumulative damage of joints in ocean structural parts, one type of low carbon steel Q345D was employed to prepare designed T-type specimens, and a series of fatigue experiments were carried out on the specimens under two-step repeating variable amplitude loading condition. The chosen high cyclic loads were larger than the constant amplitude fatigue limit (CAFL) and the chosen low cyclic loads were below the CAFL. Firstly, the S-N curve of designed T-type specimen was obtained via different constant amplitude fatigue tests. Then, a series of two-step repeating variable load were carried out on designed T-type specimens with the aim of calculating the cumulative damage of specimen under the variable fatigue load. The discussions about non-linear fatigue cumulative damage of designed T-type specimens and the interaction effect between the high and low amplitude loadings on the fatigue life were carried out, and some meaningful conclusions were obtained according to the series of fatigue tests. The results show that fatigue cumulative damage of designed T-type specimens calculated based on Miner’s rule ranges from 0.513 to 1.756. Under the same cycle ratio, the cumulative damage increases with the increase of high cyclic stress, and at the same stress ratio, the cumulative damage increases linearly with the increase of cycle ratio. Based on the non-linear damage evaluation method, it is found that the load interaction effect between high and low stress loads exhibits different damage or strengthening effects with the change of stress ratio and cycle ratio.

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