Inertial effect on concrete-like materials under dynamic direct tension

the effect of esp materials on medical studentsreading proficiency

چکیده این تحقیق " مواد درسی " را به عنوان یکی از بحث برانگیزترین موضوعات آموزش زبان تلقی کرده و درتلاش است به سه سوال عمده پاسخ دهد: 1) آیا بکارگیری جزوات گرداوری شده توسط گروهی از مدرسین تاثیر بسزایی در میزان توانش خواندن و درک متون انگلیسی دانشجویان پزشکی دارد؟ 2) آیا استفاده از مواد درسی اصلی( بین المللی )، توانش خواندن و درک متون انگلیسی دانشجویان پزشکی را به طور چشمگیری تحت تاثیر قرار م...

The Dynamic Behavior of Concrete Materials

Influence of Stress Concentration Factor on Magnetic Memory Effect of Steel Samples under Dynamic Tension Load

Under the excitation of geomagnetic field, normal component of surface scattering magnetic field intensity Hp(y) changes of steel tensile samples with different stress concentration factors α were studied. Constant amplitude sinusoidal tensile load cycles were applied on 18CrNi4A steel plate samples whose α were respectively 1, 3 and 5. Then the correlation of Hp(y) value changes with loading c...

Entropic stabilization of nanoscale voids in materials under tension.

While preexisting defects are known to act as nucleation sites for plastic deformation in shocked materials, the kinetics of the early stages of plastic yield are still poorly understood. We use atomistic simulation techniques to investigate the kinetics of plastic yield around small preexisting voids in copper single crystals under uniaxial tensile strain. We demonstrate that at finite tempera...

Effect of Reinforcement Type on the Tension Stiffening Model of Ultra-High Performance Concrete (UHPC)

Ultra-high performance concrete (UHPC) is a developing concrete and today is increasing to interest using it in structures due to its advantages such as high-compressive strength, modulus of elasticity, highly durability and low-permeability. Therefore, it is necessary to provide models for prediction of nonlinear behavior of this material. This study is aimed to investigate the tension-stiffen...