High temperature fatigue crack propagation in Inconel718

In this work, three different series of fatigue experiments on INCONEL718 will be discussed. For each type of fatigue experiment, the method of evaluation the raw data obtained at the matrial laboratory will be mentioned. Morover, from the obtained results, the fatigue properties of INCONEL718 will be presented in detail. Subsequently, a discussion of the modeling of the fatigue properties of the material in an isothermal condition will be permormed. For that, three different type om models will be investigated and compared. Furthermore, a FEM model of a specific specimen used for TMF-testing (not to be discussed here) will be presented by which the stress intensity factor values can be evaluated

A Continuum model for skeletal muscle contraction at homogeneous finite deformations

N.B.: When citing this work, cite the original article. The original publication is available at www.springerlink.com: Babak Sharifimajd and Jonas Stålhand, A Continuum model for skeletal muscle contraction a

A continuum model for skeletal muscle contraction at homogeneous finite deformations

The contractile force in skeletal muscle models is commonly postulated to be the isometric force multiplied by a set of experimentally motivated functions which account for the muscle’s active properties. Although both flexible and simple, this approach does not automatically guarantee a thermodynamically consistent behavior. In contrast, the continuum mechanical model proposed herein is derived from fundamental principles in mechanics and guarantees a dissipative behavior. Further, the contractile force is associated with a friction clutch which provides a simple and well-defined macroscopic model for cycling cross-bridges. To show the performance of the model, it is specialized to standard experiments for rabbit tibialis anterior muscle. The results show that the model is able to capture important characteristics of skeletal muscle

Fatigue crack growth behaviour of Inconel 718 with high temperature hold times

In this work, fatigue crack growth measurements have been made on center-cracked tension specimens of Inconel 718, where the focus has been to observe the effect of high temperature hold times on the fatigue crack growth behaviour of the material. The material testing has been done at three different temperatures, namely 450 degrees C, 550 degrees C and 650 degrees C. All testing were done in an isothermal LCF context with a standard test method for measuring the fatigue crack growth rates

Fatigue crack growth behaviour of Inconel 718 with high temperature hold times

In this work, fatigue crack growth measurements have been made on center-cracked tension specimens of Inconel 718, where the focus has been to observe the effect of high temperature hold times on the fatigue crack growth behaviour of the material. The material testing has been done at three different temperatures, namely 450 degrees C, 550 degrees C and 650 degrees C. All testing were done in an isothermal LCF context with a standard test method for measuring the fatigue crack growth rates