Deformation Failure Characteristics of Crystalline Marble Under Triaxial Cyclic Loading

2022 ◽  
pp. 177-202
Author(s):  
Sheng-Qi Yang
Keyword(s):  
Cyclic Loading ◽  
Failure Characteristics

Arthroscopic Suture Material and Knot Type

2009 ◽  
Vol 37 (8) ◽  
pp. 1578-1585 ◽  
Author(s):  
Kenneth G. Swan ◽  
Todd Baldini ◽  
Eric C. McCarty
Keyword(s):  
Cyclic Loading ◽  
Failure Load ◽  
Suture Material ◽  
Medical Center ◽  
Maximum Load ◽  
Suture Materials ◽  
Failure Characteristics ◽  
Failure Data ◽  
Load To Failure ◽  
Range Test

Background Several new arthroscopic suture materials are available. It is important for surgeons to know which suture-knot combination provides the strongest construct. Hypothesis The newer, polyblend sutures have dissimilar load-to-failure characteristics. Study Design Controlled laboratory study. Methods The load to failure of 4 knots was evaluated (surgeon's, Duncan loop, Samsung Medical Center [SMC], and Roeder) using 5 No. 2 suture materials (Ethibond, Ticron, FiberWire, ForceFiber, MaxBraid). One surgeon tied all knots. Fifteen samples were tested for each suture-knot configuration. Knots were pretensioned to 10 N, then loaded to failure at a rate of 1.0 mm/s. Failure load recorded was the maximum load applied between 0 and 3 mm of displacement. Cyclic loading of suture-knot samples was performed on 3 knots (surgeon's, Duncan loop, and SMC) using 4 suture materials (Ethibond, FiberWire, ForceFiber, MaxBraid). Six samples were tested for each suture-knot configuration. Knots were cyclically loaded from 5 to 40 N at 0.5 Hz for 1000 cycles, then loaded to failure. Data were compared with analysis of variance and the Tukey multiple range test and considered significant at P <. 05. Results The surgeon's and SMC knots were strongest, particularly if tied using MaxBraid or ForceFiber. With single load-to-failure testing, MaxBraid was significantly stronger than Ethibond, Ticron, or FiberWire, regardless of knot type used. ForceFiber was stronger than Ethibond and Ticron with any knot type, and stronger than FiberWire when tied with a surgeon's knot or Roeder knot. The MaxBraid surgeon's knot (246 N) and MaxBraid SMC knot (239 N) were more than twice as strong as the Ethibond surgeon's knot (111 N) and Ethibond SMC (118 N). With cyclic loading, MaxBraid and ForceFiber were stronger than FiberWire and Ethibond, regardless of knot type tied. The SMC knot using MaxBraid withstood the highest load, and was stronger than the Duncan loop tied with MaxBraid. When stricter criteria (1-mm and 2-mm displacement) for failure were used, MaxBraid and ForceFiber remained superior to other sutures, including FiberWire, but knot type became less significant. Conclusion Nonabsorbable polyblend sutures are stronger than traditional sutures, but not all polyblend sutures are alike. MaxBraid and ForceFiber provide a stronger knot than FiberWire, Ethibond, and Ticron, particularly if tied using a surgeon's or SMC knot. Clinical Relevance The SMC knot using MaxBraid provides the strongest knot/suture combination of knots and sutures tested.

scholarly journals Experimental Study on Mechanical Properties of Deep Buried Granite under Different Confining Pressures

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Jun Zhao ◽  
Tan Zhang
Keyword(s):  
Cyclic Loading ◽  
Confining Pressure ◽  
Surrounding Rock ◽  
Underground Engineering ◽  
Failure Characteristics ◽  
Deformation And Failure ◽  
Cyclic Loading And Unloading ◽  
Confining Pressures ◽  
Crack Damage Stress ◽  
Loading And Unloading

Brittle failure of hard rock poses a serious threat to the stability of surrounding rock in deep underground engineering. In order to study the deformation and failure characteristics of deep buried granite under high confining pressure cyclic loading and unloading, MTS815 electro-hydraulic servo rock test system was used to conduct cyclic loading and unloading tests under confining pressures of 15 MPa, 35 MPa, 45 MPa, and 55 MPa, and the corresponding stress-strain curves and deformation failure characteristic curves were obtained. The experimental results show the follows: (1) under the same confining pressure, the peak strength, crack initiation stress, crack damage stress, and Poisson’s ratio of the specimens under cyclic loading and unloading are larger than those under conventional triaxial loading and unloading, and the unloading elastic modulus is smaller than that, under conventional triaxial compression; (2) the results show that, under different confining pressures, the granite samples show obvious brittle failure characteristics, the elastic modulus and crack initiation stress increase first and then decrease with the confining pressure, the peak strength and crack damage stress of the samples increase linearly with the confining pressure, and Poisson’s ratio increases first and then remains unchanged with the confining pressure; (3) under the two kinds of stress conditions, the macroscopic failure of the samples is mainly shear failure. The deformation and failure law of granite samples revealed in this study has significant reference value for the selection of rock mass mechanical model of surrounding rock stability of underground engineering, the formulation of surrounding rock support countermeasures, and the evolution law of mechanical parameters with damage variables.

Failure Characteristics of Apple Tissue Under Cyclic Loading

1984 ◽  
Vol 27 (1) ◽  
pp. 311-320 ◽  
Author(s):  
N. B. McLaughlin ◽  
R. E. Pitt
Keyword(s):  
Cyclic Loading ◽  
Failure Characteristics ◽  
Apple Tissue

Effects of prior cyclic loading damage on failure characteristics of sandstone under true-triaxial unloading conditions

2020 ◽  
Vol 132 ◽  
pp. 104379
Author(s):  
Fan Xiao ◽  
Deyi Jiang ◽  
Fei Wu ◽  
Quanle Zou ◽  
Jie Chen ◽  
...  
Keyword(s):  
Cyclic Loading ◽  
Failure Characteristics ◽  
True Triaxial

Mechanical properties and failure characteristics of a recycled CFRP under tensile and cyclic loading

2013 ◽  
Vol 55 ◽  
pp. 257-267 ◽  
Author(s):  
Mitsuhiro Okayasu ◽  
Tomohiro Yamazaki ◽  
Kohei Ota ◽  
Keiji Ogi ◽  
Tetsuro Shiraishi
Keyword(s):  
Mechanical Properties ◽  
Cyclic Loading ◽  
Failure Characteristics

scholarly journals Failure Characteristics of PZT Ceramic During Cyclic Loading

2020 ◽  
Vol 49 (9) ◽  
pp. 5534-5541
Author(s):  
Mitsuhiro Okayasu ◽  
Tsukasa Ogawa
Keyword(s):  
Cyclic Loading ◽  
Failure Characteristics ◽  
Pzt Ceramic

Deformation Failure Characteristics and Loading Rate Effect of Sandstone Under Uniaxial Cyclic Loading and Unloading

2018 ◽  
Vol 37 (3) ◽  
pp. 1147-1154 ◽  
Author(s):  
Xuejun Zhu ◽  
Yangyang Li ◽  
Changxiang Wang ◽  
Xizhen Sun ◽  
Zhanxin Liu
Keyword(s):  
Cyclic Loading ◽  
Loading Rate ◽  
Rate Effect ◽  
Failure Characteristics ◽  
Cyclic Loading And Unloading ◽  
Loading And Unloading
Sign in / Sign up

Export Citation Format

Share Document