In coal mining hard roofs are one of the main factors causing the occurrence of rock bursts in working panels. To solve this problem, the solid backfill coal mining (SBCM) technique is proposed and used as an effective measure to prevent the rock bursts induced by hard roofs. However, due to the different backfill ratios of working planes, the control effects on hard roofs are quite unique. By ...

Metastable austenitic stainless steel was investigated during fatigue tests under strain control with either constant total or plastic amplitude. Two different material conditions coarse-grained and ultrafine-grained microstructure were in focus. The influence of the test on both martensitic phase transformation as well lives is discussed. In addition, an approach for calculating Coffin–Manson–...

Thermal-mechanical fatigue (TMF) tests and isothermal (IF) were conducted using thin-walled tubular specimens under strain-controlled conditions. The results of TMF showed a strong correlation between mechanical behavior temperature cycling. Under different phases loading, the hysteresis loop mean stress single crystal superalloy noticeable variations stress-controlled In test, cycling led to a...

Unlike the electrical conductance that can be widely modulated within same material even in deep nanoscale devices, tuning thermal a single system or nanostructure is extremely challenging and requires large-scale device. This prohibits realization of robust ON/OFF states switching flow currents. Here, we present theory switch based on resonant coupling three photonic resonators, analogy to fie...

Fully reversed stress-controlled tension–compression fatigue experiments (R = −1) were conducted to study the cyclic deformation and behavior of 7075-T651 aluminum alloys with without a surface mechanical rolling treatment (SMRT). The strain amplitude, ratcheting effect, asymmetric base metal (BM) SMRT specimens analyzed. showed more remarkable effects asymmetry under high stresses. Fatigue tes...

Strain-controlled out-of-phase thermo-mechanical fatigue tests at 100–500 °C and various strain ranges were conducted on five cast iron grades, including one lamellar, three compacted spheroidal graphite iron. Investigations of morphology matrix characteristics performed to associate parameters, such as geometrical features inclusions the microhardness, performance each grade. From this, life a...

The mechanical behaviors of five polyether block amide foams, obtained by mold-opening foam injection process, were investigated with regard to their microstructures. materials vary in mass ratios hard versus soft segments, and/or process packing time. resulting microstructures have been characterized terms cavity size and shape ratios, analyzing scanning electron microscope images after carefu...

Significant reduction of the overpotential NRR by adjusting bond length Cr–N in CrN 3 @graphene.