BASED on vast experience watching the fruit of my hard work fall apart time and again, I feel highly qualified to discuss the manner in which systems break. In particular, the goal of this paper is to define and analyze systems which exhibit brittle behavior. This behavior is characterized by a sudden and steep decline in performance as system state changes as shown by point D along curve Ph in...

In recent years, ExxonMobil has undertaken a comprehensive experimental and numerical program to characterize tensile strain capacity of welded pipelines under different operational, geometric and material property conditions. Key parameters affecting tensile strain capacity have been identified through sensitivity studies and used in a large-scale FEAbased parametric study to develop closed-fo...

BACKGROUND Atherosclerosis is the underlying cause of the majority of myocardial infarctions and ischemic strokes. Carotid intima-media thickness (IMT) is a surrogate measure of atherosclerotic cardiovascular disease. Left ventricular (LV) function can be accurately assessed by 2D speckle-tracking strain echocardiography (2D-STE). The aim of this study was to assess the relationship between car...

In order to realize a better description of plastic flow behavior in the warm deformation process GH4149, GH4169 superalloy was compressed by Gleeble-3800 at temperature 700–900 °C and strain rate 0.01–10 s?1. The constitutive model established using artificial neural network (ANN) Arrhenius equation, accuracy compared. results show that average absolute relative error (AARE) ANN is 4.34%. AARE...