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fatigue life

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Journal Articles
AM&P Technical Articles (2023) 181 (7): 40–42.
Published: 01 October 2023
...Brian T. Berg; Kenneth I. Aycock; Wayne M. Falk; Jason D. Weaver This article reports on a multifaceted testing and modeling approach to investigate the fatigue life of medical grade Nitinol to one billion cycles. The goal of a the research is to understand the mechanism of Nitinol ultra-high cycle...
Journal Articles
AM&P Technical Articles (2013) 171 (6): 18–21.
Published: 01 June 2013
...C.J. Szczepanski; P.A. Shade; M.A. Groeber; J.M. Larsen; S.K. Jha; R. Wheeler A microscale fatigue testing technique for characterizing mechanical response and relating it to microstructure promises to improve fatigue life prediction for turbine engine components. A microscale fatigue testing...
Journal Articles
AM&P Technical Articles (2020) 178 (2): 20–24.
Published: 01 February 2020
...Yumo Jiang; Yong Zhao; Shengchong Ma; Yuhang Duan; Keng Yan A novel approach in the field of narrow gap laser welding produces superior weld joint quality, especially the configuration of weld toe, which has a positive effect on fatigue life. A novel approach in the field of narrow gap laser...
Journal Articles
AM&P Technical Articles (2016) 174 (3): 16–20.
Published: 01 March 2016
... performance. The response of cyclic stress amplitude as a function of the number of cycles at different strain amplitudes was measured for the research alloy. Fatigue life decreased and stress amplitude increased with increasing strain amplitude for the T6 temper condition. At lower total strain amplitudes...
Journal Articles
AM&P Technical Articles (2013) 171 (5): 29–32.
Published: 01 May 2013
... performance of 2- mm thick AM60 casting to 2-mm thick laser-assisted self-piercing riveted (LSPR) lap AZ31 sheet joints were investigated. Fatigue load corre- 2-mm thick AM60 casting to 2.4-mm sponding to 100,000 cycle life was compared thick AM30 extrusion with quasi-static peak load of the LSPR joints...
Journal Articles
AM&P Technical Articles (2016) 174 (6): 35–37.
Published: 01 June 2016
... at a stress of 150 ksi (sample size: 6 in. long with 2 in. taper section; 0.75 in. diam.; 0.375 in. minor diam Fig. 2 Improvement in rotating bending fatigue life of ITMP samples over baseline properties. Evaluation of reverse torsion fatigue in torsion shafts was not completed due to incompatibility...
Journal Articles
AM&P Technical Articles (2021) 179 (3): 52–55.
Published: 01 April 2021
... the sensitivity of Nitinol to thermal processing and surface treatments, the guidance recommends that experiments to determine constitutive law parameters or constant life curves (i.e., for fatigue safety factor calculations) be conducted on test specimens representative of the final manufactured device. Given...
Journal Articles
AM&P Technical Articles (2019) 177 (4): 38–42.
Published: 01 May 2019
... image of a typical spall failure is shown in Fig. 6. Fatigue results were analyzed using a Weibull probability distribution[15]. Weibull distributions provide accurate predictions of failure probability and enable life cycle and reliability comparisons between different population groups...
Journal Articles
AM&P Technical Articles (2021) 179 (7): 41–45.
Published: 01 October 2021
..., and resistance to torsional fracture[28]. During the shaping procedure, cyclic stresses occur along the file length from rotation with bending inside the canal. The fatigue life depends on the degree of curvature of the canal[29]. Heat treatments are widely used to 43 Fig. 4 SEM image of laser processed NiTi...
Journal Articles
AM&P Technical Articles (2016) 174 (4): 16–20.
Published: 01 April 2016
... theoretically infinite life. Because fatigue failures can occur quickly if the endurance limit is exceeded, performance must be guaranteed by demonstrating adequate fatigue strengths through cyclical testing that simulates installed conditions. S-N curves are derived from tests on samples of the material...
Journal Articles
AM&P Technical Articles (2018) 176 (2): 26–28.
Published: 01 February 2018
... including wear, fatigue, creep, and fracture toughness are listed in Fig. 1. This article discusses examples from various industries where new materials and surface modifications are used to extend the useful life of engineering components and equipment. Fig. 1 Variables affecting predictable...
Journal Articles
AM&P Technical Articles (2023) 181 (6): 46–49.
Published: 01 September 2023
... grain size for Fig. 1 Main loading directions of rolling-element bearing structures. Adapted from Ref 1. eight ball-bearing materials (three heat treatment lots of each material). Hardness is an important variable in rolling-contact BEARING MATERIALS fatigue and can significantly affect bearing life...
Journal Articles
AM&P Technical Articles (2024) 182 (3): 49–52.
Published: 01 April 2024
... a prototype to harvest the full potential of the elastocaloric effect has been challenging. The stress required for phase transformation may be too high for traditional motors, the cost of the working materials (typically NiTi-base alloys) may be too expensive and have a short fatigue life, and the heat...
Journal Articles
AM&P Technical Articles (2017) 175 (6): 23–26.
Published: 01 September 2017
.... Fatigue resistance is critical for aircraft components, and hard coatings reduce fatigue life by fatigue debit. As the CVD coating cools from its application temperature of 840°F to room temperature, the mismatch in thermal expansion coefficient between coating and substrate results in a compressive...
Journal Articles
AM&P Technical Articles (2022) 180 (3): 25–28.
Published: 01 April 2022
... in aerospace, automotive, medical device, and other industries that require high reliability and extremely long performance life. Compared with conventional fatigue tests, ultrasonic testing provides both faster test speeds and the unique ability to test to extremely high cycle numbers in a practical time...
Journal Articles
AM&P Technical Articles (2015) 173 (2): 22–27.
Published: 01 February 2015
... and fatigue life of steel heat-treated components. crostructure of carbon contents close to the core may be difficult to discern. The MAD determined by hardness traverse This article explores some factors that may be slightly shallower than that de- cause decarburization while concentrat- termined...
Journal Articles
AM&P Technical Articles (2020) 178 (7): 35–37.
Published: 01 October 2020
...., Inclusions Size-based Fatigue Life Prediction Model of NiTi Alloy for Biomedical Applications, Shape Memory and Superelasticity, 1(2), p 240-251, 2015. 9. A.R. Pelton, et al., The Quest for Fatigue-Resistant Nitinol for Medical Implants, in STP1616: Fourth Symposium on Fatigue and Fracture of Metallic...
Journal Articles
AM&P Technical Articles (2015) 173 (9): 23–25.
Published: 01 October 2015
... in the weld using base material properties and keeping other conditions the same. Figure 9 shows the predicted maximum principal stress with EBW without using filler metal. High stress near the weld disappears, as shown in Fig. 9. Therefore, EBW is an effective method to improve the creep-fatigue life...
Journal Articles
AM&P Technical Articles (2018) 176 (5): 44–46.
Published: 01 July 2018
...., strain) component, so an overall compressive stress on the surface is and sin2 . A biaxial stress model is then used to convert the typically the preferred state to enhance the fatigue life of the measured strain to the stress. component. It is therefore imperative to characterize the re- X-ray...
Journal Articles
AM&P Technical Articles (2015) 173 (3): 24–27.
Published: 01 March 2015
...), and 2.0% Ni (solid squares), developed by Toda, et al. Data of conventional T92 steel (open triangles) are plotted for comparison[1]. (premature creep failure at the HAZ) found in F-M steels and offer advantages in thermomechanical fatigue life in comparison to all other material types, such alloy design...