in this paper, dissimilar resistance spot welding of aisi 1075 eutectoid steel to aisi 201 stainless steel is investigated experimentally. for this purpose, the experiments are designed using response surface methodology and based on four-factor, five-level central composite design. the effects of process parameters such as welding current, welding time, cooling time and electrode force are inv...

An in-depth understanding of damage threshold behavior during rock and failure is critical to predicting short- long-term stability. The percolation theory was used describe the Renormalization Group accurately solve theoretical solution brittle failure. By redefining stress-transfer mechanism between blocks, expression calculated based on theory. experimental investigation shale samples by in-...

One of the most important instabilities of rock slopes is toppling failure. Among the types of toppling failure, block-flexural failures are more common instability which occurs in nature. In this failure, some rock blocks break because of tensile stresses, and some overturn under their weights, and next to all of them topple together. Physical and theoretical modeling of this failure is studie...

Steel Plate Shear Wall (SPSW) is an emerging seismic load-resistant system that, compared to other systems, enjoys the advantages of stable ductile behavior, fewer detailing requirements, rapid constructability, and economy. American seismic provisions decree that a SPSW should be designed as a moment frame with a web infill plate. Specifically, in case of buildings taller than 160 ft, it decre...

Introduction: Laboratory measurements of meteorite reflectance spectra rarely match telescopic observations of asteroid reflectance spectra due to the process (es) of space weathering, which rapidly darken and redden asteroid surface on million-year timescales [e.g. 1-2]. While most main belt asteroids appear weathered, a fraction of near-Earth asteroids (the Q-types) appear unweathered – possi...

The main objective of this study is to propose the Strut-and-Tie method (STM) to predict the shear capacity of simply supported RC deep beams shear-strengthened with carbon fiber reinforced polymers (CFRP). It is assumed that, the total carried shear force by shear-strengthened RC deep beam provided by three independent resistance, namely diagonal concrete strut due to Strut-and-tie mechanism, ...

The stability control of the surrounding rock is greatly influenced by joint’s shear mechanical characteristics and deformation failure mechanism. A numerical model dentate joints was created using a particle flow discrete element method (DEM). To study behavior damage evolution joints, simulation test under same normal stress conducted. Additionally, joints’ mechanism mode were investigated fr...

Keywords: Shear strength Microstructure Single-shear lap joint Intermetallic compound (IMC) Aging a b s t r a c t The effects of isothermal aging on the microstructure and shear strength of Sn37Pb/Cu solder joints were investigated. Single-lap shear solder joints of eutectic Sn37Pb solder were aged for 1–10 days at 120 °C and 170 °C, respectively, and then loaded to failure in shear with a cons...

The pharmacokinetics of recombinant human erythropoietin (rHuEpo) administered intravenously has been investigated in a group of five patients with chronic renal failure who were dialysis-dependent. The half-life of circulating erythropoietin decreased from 7.9±OA hr (mean ±SO) at the beginning of treatment to 6.2±O.6 hr after 6 weeks and 5A±O.9 hr after 4 months of treatment. In spite of t...