Topic
Fatigue limit
About: Fatigue limit is a research topic. Over the lifetime, 20489 publications have been published within this topic receiving 305744 citations. The topic is also known as: endurance limit & fatigue strength.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this article, the microscopic damage and progressive failure of a composite reinforced by plain-weave glass cloth under tensile fatigue loading was investigated, and it was found that the internal damage at each stage (matrix cracks, debonds in the weft, successive debond in the warp and metadelaminations between warps and wefts) occurred near the crossover point of the fabric.
82 citations
TL;DR: In this paper, a fatigue study of composite adhesive lap joints produced from a bi-directional woven E-glass fibres and polypropylene is presented in the form of curves of stress amplitude versus number of cycles to failure against time to exposure in water for fixed stress amplitudes.
82 citations
TL;DR: In this paper, the effect of purity and process parameters on the fatigue behavior of ultrafine grained (UFG) copper produced by high pressure torsion (HPT) was studied.
82 citations
TL;DR: This paper investigated the flexural behavior of corroded steel reinforced concrete beams repaired with carbon-fiber-reinforced polymer (CFRP) sheets under repeated loading and found that CFRP sheets increased the fatigue capacity of the beams with corroded reinforced steel reinforcement beyond that of the control unrepaired beams with uncorroded steel reinforcement.
Abstract: This study investigated the flexural behavior of corroded steel reinforced concrete beams repaired with carbon-fiber-reinforced polymer (CFRP) sheets under repeated loading. Thirty beams ( 152×254×2,000 mm ) were constructed and tested. Fatigue flexural failure occurred in 29 of these beams. The study showed that pitting of the steel reinforcement due to corrosion occurred only after about a 7% actual mass loss which coincided with a decrease in the fatigue performance of the beam. The controlling factor for the fatigue strength of the beams is the fatigue strength of the steel bars. Repairing with CFRP sheets increased the fatigue capacity of the beams with corroded steel reinforcement beyond that of the control unrepaired beams with uncorroded steel reinforcement. Beams repaired with CFRP at a medium corrosion level and then further corroded to a high corrosion level before testing had a comparable fatigue performance to those that were repaired and tested after corroding directly to a high corrosion level.
82 citations
TL;DR: The fatigue behaviour of NiTi rotary instrument is typical of most metals, provided that the analysis is based on the surface strain amplitude, and showed a high-cycle and a LCF region, while the LCF life is adversely affected by water.
Abstract: Aim To examine the fatigue behaviour using a strain-life approach, and to determine the effect of water on the fatigue life of a NiTi rotary instrument.
Methodology Instruments of one brand of NiTi engine-file (size 25, ProFile 0.04 and 0.06) were subjected to rotational bending either in air or under water, the number of revolutions to fracture (Nf) being recorded using an optical counter and an electronic break-detection circuit. The effective surface strain amplitude (ɛa) for each specimen was determined from the curvature of the instrument (on a photograph) and the diameter of the fracture cross-section (from a scanning electron micrograph of the fracture surface). Strain was plotted against fatigue life and the low-cycle fatigue (LCF) region identified. Values were examined using two-way analysis of variance for difference between various instrument–environment combinations.
Results A total of 212 instruments were tested. A strain-life relationship typical of metals was found. Nf declined with an inverse power function dependence on ɛa. A fatigue limit was present at about 0.7% strain. The apparent fatigue-ductility exponent, a material constant for the LCF life of metals, was found to be between −0.45 and −0.55. There was a significant effect of the environmental condition on the LCF life, water being more detrimental than air.
Conclusions The fatigue behaviour of NiTi rotary instrument is typical of most metals, provided that the analysis is based on the surface strain amplitude, and showed a high-cycle and a LCF region. The LCF life is adversely affected by water.
82 citations