Steel-concrete-steel (SCS) sandwich panels are composed of two steel plates with low thicknesses and high densities and strengths and one thick layer between both plates with low strength and density known as core that is composed of concrete. Cohesive material-epoxy resin or shear connectors are usually used to connect the plates to the concrete core. SCS sandwich composites are being develope...

The gateway of the thick coal seam working face in Datong mining area was excavated along a small pillar, resulting serious bolt (cable) breaking failure, strong surrounding rock deformation, ground pressure appearance, and difficulties control. So, characteristics corresponding causes 5106 return air with pillar Dongzhouyao mine (a area) were analyzed through an on-site investigation, geotechn...

Rock bolts ensure structural stability for tunnels and many other underground structures. The pre-load on a rock bolt plays an important role in the structural reinforcement and it is vital to monitor the pre-load status of rock bolts. In this paper, a rock bolt pre-load monitoring method based on the piezoceramic enabled time reversal method is proposed. A lead zirconate titanate (PZT) patch t...

In coal mining, as the mining depth increases, a complex mechanical environment of “high ground stress”, temperature”, karst water pressure”, and “mining disturbance”, namely “three highs one disturbance” appears. Many roadways have characteristics soft rock with large deformation, pressure, difficult support, high support cost, which brings severe challenges to safe efficient production mines....

The gob-side entry driving is in low pressure area, which bears less support and easy to maintain, so it widely used. Taking the thick coal seam of Dongtan Coal Mine as an example, reasonable size pillar section roadway are numerically simulated by combining numerical with measurement, designed. According distribution lateral stress working face, eight pillars different sizes By simulating comp...

in this research, the influence of bolt preload on the fatigue strength of 2024-t3 aluminium alloy double lap bolted joints has been studied experimentally and numerically. to do so, three sets of the specimens were prepared and each of them subjected to tightening torque of 1,2.5 and 5 n-m and then fatigue tests were conducted under various cyclic axial load levels. in the numerical method, th...

OBJECTIVES The Sliding Hip Screw (SHS) is commonly used to treat trochanteric hip fractures. Fixation failure is a devastating complication requiring complex revision surgery. One mode of fixation failure is lag screw cut-out which is greatest in unstable fracture patterns and when the tip-apex distance of the lag screw is > 25 mm. The X-Bolt Dynamic Hip Plating System (X-Bolt Orthopaedics, Dub...

For many years U.S. design codes modeled the design values of a multiple-bolt joint as the design value of a single-bolt connection multiplied by the number of bolts. The provisions were based on research conducted by Trayer (1932) who observed an equal distribution of load among bolts. This was despite the fact that research conducted as early as in the late 19 century suggested an uneven load...

this paper presents the results of the assembly process of a gasketed bolted flanged pipe joint for two different bolt tightening strategies, i.e. asme and industrial using torque control of preload method.  the final clamping force is achieved in four and five passes in asme and industrial strategy respectively. axial bolt stress variation, at the end of each pass, individual bolt bending beha...