At present, a significant part of oil is extracted from difficult-to-develop reservoirs with low permeability. Hydraulic fracturing one the most important methods production stimulation. Scientific articles do not describe connections between flow-rate in well and change pressure hydraulic fracture or changing fracture, except some cases constant fluid-flow production. We obtained both exact an...

Ionomers are interesting due to their applications in coatings, adhesives, films and packaging materials. A study of the underlying mechanisms for fracture in ionomers is consequently of both practical as well as theoretical interest. In this study, we employ high speed imaging coupled with uniaxial extensional rheometry to delineate the mechanics leading to the brittle fracture of ionomer melt...

BACKGROUND The effects of dietary protein on bone health are controversial. OBJECTIVE We examined the relation between protein intake with fracture and bone mineral density (BMD) within the Women's Health Initiative (WHI). DESIGN This prospective analysis included 144,580 women aged 50-79 y at baseline in the WHI clinical trials (CTs) and observational study (OS) that recruited participants...

Pain management and opioid consumption after distal radius fracture (DRF) open reduction and internal fixation (ORIF) are highly variable and poorly understood. To optimize postoperative opioid dosage and better understand opioid consumption patterns after DRF-ORIF, we conducted a prospective study with the hypothesis that opioid consumption would increase with worsening fracture classification...

We propose inverse problems of crack propagation using the phase-field models. First, we study in an inhomogeneous media which fracture toughness varies space. Using two models based on different surface energy functionals, perform simulations and show that $J$-integral reflects effective toughness. Then, formulate regression to estimate space-dependent from path. Our method successfully estima...

The accuracy of an adopted cohesive zone model (CZM) can affect the simulated fracture response significantly. The CZM has been usually obtained using global experimental response, e.g., load versus either crack opening displacement or load-line displacement. Apparently, deduction of a local material property from a global response does not provide full confidence of the adopted model. The diff...

Matrix relations in kinematics and dynamics of the Star parallel manipulator are established in this paper. The prototype of the manipulator is a three-degree-of-freedom mechanism, which consists of a system of parallel kinematical chains connecting to a moving platform. Knowing the translation motion of the platform, we develop first the inverse kinematics problem and determine the position, v...