In this paper, a strain-intensity-factor-based method is proposed to calculate the fatigue crack growth under the fully reversed loading condition. A theoretical analysis is conducted in detail to demonstrate that the strain intensity factor is likely to be a better driving parameter correlated with the fatigue crack growth rate than the stress intensity factor (SIF), especially for some metall...

We have tested the mechanical properties of isolated canine pericardium at 37°C in Hanks' solution, and compared those results with similar tests on tissue at room temperature, both in Hanks' solution and merely kept moist with saline. Pericardium, which is nearly isotropic due to the layers of collagen aligned in different directions, is a composite material made up of collagen and elastin fib...

The purpose of this investigation was to learn what part of the carotid sinus baroreceptor response is attributable to the gross mechanical properties of the wall and what part to the receptor elements. Static pressure forcings were applied to an isolated dog carotid sinus preparation while baroreceptor nerve activity was recorded; carotid sinus deformation was measured from still photographs t...

To study the deformation and failure behavior of open-graded friction course (OGFC) before cracking at low temperatures, a four-point bending test trabecula was conducted, process monitored by digital speckle method (DSM). The distribution law strain field trabecular specimens analyzed. horizontal gradually changed from uniform to concentration area with loading. crack initiation time, strain, ...

Using insitu digital image correlation to obtain full-field measurements, we study the intermartensitic transformations in single crystal NiFeGa. Full-field strain measurements identify the coexistence of modulated martensite phases during the first plateau of the multistage stress-strain curve at room temperature. At a higher temperature, the measurements indicate the bypassing of one of the m...

Low-temperature plastic flow in TRIP steels has been found to be controlled by stress-assisted isothermal martensitic transformation. For these conditions, the thermodynamics and kinetic theory of martensitic transformations leads directly to constitutive relations predicting the dependence of flow stress on temperature, strain, strain-rate, and stress-state, consistent with the observed behavi...

This article reports an unexpected finding of the mechanical behavior Al-12%Si alloy manufactured using laser powder bed fusion (L-PBF) process. The as-manufactured specimen has a negative strain rate sensitivity flow stress at early stage tensile deformation (below 3% in strain). post heat-treated specimens exhibited positive strain-rate and none these serrated stress-strain curve, indicating ...

BACKGROUND The value of left atrial (LA) diameter, volume, and strain to risk stratify hypertrophic cardiomyopathy patients for new-onset atrial fibrillation (AF) was explored. METHODS AND RESULTS A total of 242 hypertrophic cardiomyopathy patients without AF history were evaluated by (speckle-tracking) echocardiography. During mean follow-up of 4.8±3.7 years, 41 patients (17%) developed new-...