Fatigue Resistance and Failure Behavior of Reaction Compatibilized PC/ABS Blends  Under Tensile Cyclic Loading

2021 ◽  
Author(s):  
Meng Ma ◽  
Chencheng Yu ◽  
Lei Bai ◽  
Si Chen ◽  
Yanqin Shi ◽  
...  
Keyword(s):  
Cyclic Loading ◽  
Fatigue Resistance ◽  
Failure Behavior

scholarly journals Fatigue Resistance and Failure Behavior of Penetration and Non-Penetration Laser Welded Lap Joints

2021 ◽  
Vol 34 (1) ◽  
Author(s):  
Xiangzhong Guo ◽  
Wei Liu ◽  
Xiqing Li ◽  
Haowen Shi ◽  
Zhikun Song
Keyword(s):  
Fatigue Resistance ◽  
Failure Modes ◽  
Plate Thickness ◽  
High Stress ◽  
Lap Joints ◽  
Failure Behavior ◽  
Passenger Cars ◽  
Plate Fracture ◽  
The Difference ◽  
Railway Passenger

AbstractPenetration and non-penetration lap laser welding is the joining method for assembling side facade panels of railway passenger cars, while their fatigue performances and the difference between them are not completely understood. In this study, the fatigue resistance and failure behavior of penetration 1.5+0.8-P and non-penetration 0.8+1.5-N laser welded lap joints prepared with 0.8 mm and 1.5 mm cold-rolled 301L plates were investigated. The weld beads showed a solidification microstructure of primary ferrite with good thermal cracking resistance, and their hardness was lower than that of the plates. The 1.5+0.8-P joint exhibited better fatigue resistance to low stress amplitudes, whereas the 0.8+1.5-N joint showed greater resistance to high stress amplitudes. The failure modes of 0.8+1.5-N and 1.5+0.8-P joints were 1.5 mm and 0.8 mm lower lap plate fracture, respectively, and the primary cracks were initiated at welding fusion lines on the lap surface. There were long plastic ribs on the penetration plate fracture, but not on the non-penetration plate fracture. The fatigue resistance stresses in the crack initiation area of the penetration and non-penetration plates calculated based on the mean fatigue limits are 408 MPa and 326 MPa, respectively, which can be used as reference stress for the fatigue design of the laser welded structures. The main reason for the difference in fatigue performance between the two laser welded joints was that the asymmetrical heating in the non-penetration plate thickness resulted in higher residual stress near the welding fusion line.

Fatigue resistance of copper fiber-base rolled porous materials in high-frequency cyclic loading

1991 ◽  
Vol 30 (10) ◽  
pp. 870-872
Author(s):  
A. V. Vdovichenko ◽  
V. A. Kuz'menko ◽  
Yu. F. Lugovskoi ◽  
V. A. Nazarenko
Keyword(s):  
Cyclic Loading ◽  
Porous Materials ◽  
Fatigue Resistance ◽  
High Frequency

Performance Estimate for Slender Solid Shear Wall under Rare Earthquakes

2011 ◽  
Vol 374-377 ◽  
pp. 2152-2156
Author(s):  
Qin Chen
Keyword(s):  
Cyclic Loading ◽  
Plastic Zone ◽  
Nonlinear Analysis ◽  
Shear Wall ◽  
Lateral Force ◽  
Failure Behavior ◽  
Ultimate State ◽  
Method Performance ◽  
Method Of Calculation ◽  
Performance Estimate

An method of calculation the displacement of wall pier in plastic zone under lateral force and axial force is proposed in this paper, which can reflect the failure behavior of wall pier at ultimate state observed from 9 RC slender solid shear wall specimens under reserve cyclic loading, and the contribution of both modes of flexural and shear deformation are considered. The comparison between analytical results and experimental results indicates the effectiveness of the method. By applying the method, performance estimate for shear wall under rare earthquakes can be conducted by engineering designer, dispense with complicated nonlinear analysis.

scholarly journals Thermal Fatigue Failure Behavior of Surface/Interface of Plasma Cladding Layer

Coatings ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 646 ◽  
Author(s):  
Yang Li ◽  
Na Tan ◽  
Guo Jin ◽  
Xiufang Cui ◽  
Qiu Li
Keyword(s):  
Fatigue Resistance ◽  
Thermal Fatigue ◽  
Failure Behavior ◽  
Thermal Fatigue Resistance ◽  
Thermal Fatigue Crack ◽  
Cladding Layer ◽  
Precipitated Phase ◽  
Plasma Cladding ◽  
Element Simulation ◽  
The Difference

Co-based coating was prepared by plasma cladding on FV520B substrates. Microstructure of the coatings was observed by scanning electron microscope. Finite element simulation as a predictive method to research the stress distributed after thermal cycling. Thermal fatigue resistance of the coating-substrate was evaluated at temperature of 600 °C, 700 °C, 800 °C, and 900 °C. Results indicate that the surface/interface structure has excellent thermal fatigue resistance at 600 °C, and the thermal fatigue crack initiated near the interface and extended along the grain boundary. The difference of expansion coefficient of the coating and substrate is small near 600 °C, and the difference increased when the temperature climbed above 600 °C. The diffuse elements could be found near the interface after the thermal cycle, and the dislocations and precipitated phase were observed.

SEISMIC BEHAVIOR OF FRAMES WITH UNEVEN LARGE SECTION BEAMS OF TRADITIONAL WOODEN STRUCTURE

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Noriko Takiyama ◽  
Naoto Idate
Keyword(s):  
Cyclic Loading ◽  
Seismic Performance ◽  
Seismic Behavior ◽  
Failure Behavior ◽  
Shear Forces ◽  
Loading Test ◽  
Large Section ◽  
Cyclic Loading Test ◽  
Directional Dependence ◽  
The One

We report the progress of our research on understanding the seismic performance of frames with uneven large section beams and clarify the influence of the height of beams and the shape of fitting type joints on the behavior of the frame. In this study, we conducted a cyclic loading test for four test frames with spans of one or two and investigated the seismic performance and failure behavior. The major findings for the two-span frames are summarized as follows. (a) They caused fatal damage more readily than the one-span frames. The column that was caught in the even beams broke before other damage occurred. (b) Because of the asymmetry of the frame or the shape of the column-beam joints, the shear forces had directional dependence.

Comparison of fatigue resistance and failure modes between metal-ceramic and all-ceramic crowns by cyclic loading in water

2014 ◽  
Vol 42 (12) ◽  
pp. 1613-1620 ◽  
Author(s):  
Maj H. Nicolaisen ◽  
Golnosh Bahrami ◽  
Scott Finlay ◽  
Flemming Isidor
Keyword(s):  
Cyclic Loading ◽  
Fatigue Resistance ◽  
Failure Modes ◽  
All Ceramic ◽  
Metal Ceramic ◽  
Ceramic Crowns

The Effects of Aging of the Cyclic Stress-Strain and Fatigue Behaviors of Lead Free Solders

2013 ◽  
Author(s):  
Muhannad Mustafa ◽  
Jordan C. Roberts ◽  
Jeffrey C. Suhling ◽  
Pradeep Lall
Keyword(s):  
Cyclic Loading ◽  
Damage Accumulation ◽  
Solder Joints ◽  
Peak Load ◽  
Cyclic Stress ◽  
Lead Free ◽  
Failure Behavior ◽  
Stress Strain ◽  
Effects Of Aging ◽  
Lead Free Solders

Solder joints in electronic assemblies are typically subjected to thermal cycling, either in actual application or in accelerated life testing used for qualification. Mismatches in the thermal expansion coefficients of the assembly materials cause the solder joints to be subjected to cyclic (positive and negative) mechanical strains and stresses. This cyclic loading leads to thermomechanical fatigue damage that involves damage accumulation, crack initiation, crack propagation, and failure. In addition, the microstructure, mechanical response, and failure behavior of lead free solder joints in electronic assemblies are constantly evolving when exposed to isothermal aging and/or thermal cycling environments. While the effects of aging on solder constitutive behavior (stress-strain and creep) have been examined in some detail, there have been no prior studies on the effects of aging on solder failure and fatigue behavior. Aging leads to both grain and phase coarsening, and can cause recrystallization at Sn grain boundaries. Such changes are closely tied to the damage that occurs during cyclic mechanical loading. In this investigation, we have examined the effects of aging on the cyclic stress-strain behavior and fatigue life of lead free solders. Uniaxial solder test specimens (SAC105 and SAC305) have been prepared and subjected to cyclic stress/strain loading at different aging conditions. A four-parameter hyperbolic tangent empirical model has been used to fit the entire cyclic stress-strain curve and the hysteresis loop size (area) was calculated using definite integration for a given strain limit. This area represents the energy dissipated per cycle, which is correlated to the damage accumulation in the joint. Using the recorded cyclic stress-strain curves, the evolution of the solder hysteresis loops with aging have been characterized and empirically modeled. Similar to solder stress-strain and creep behavior, there is a strong effect of aging on the hysteresis loop size (and thus the rate of damage accumulation) in the solder specimens. Fatigue experiments were also performed, where the uniaxial specimens were subjected to cyclic loading over a particular strain range until failure. Fatigue failure in the experiments was defined to occur when there was a 50% peak load drop during mechanical cycling. Prior to testing, the specimens were aged (preconditioned) at 125 °C for various aging times, and then the samples were subjected to cyclic loading at room temperature (25 °C). It was found that aging decreased the mechanical fatigue life, and the effects of aging on the peak load drop have been studied. It has also been observed that degradations in the fatigue/failure behavior of the lead free solders with aging are highly accelerated for lower silver content alloys (e.g., SAC105). Various empirical failure criteria such as the Coffin-Manson model and the Morrow model have been used to fit the measured data, and the parameters in the models have been determined as a function of the aging conditions.

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