An effective biaxial tension and compression test method is proposed based on the shortcomings of current research for mechanical properties solid propellants under complex stress states. The equal proportion HTPB (Hydroxyl-terminated polybutadiene) NEPE (NitrateEster Plasticized Polyether) performed at different rates while room temperature, damage morphology tension–compression zone analyzed ...

High-strength aluminum alloys are of increasing interest to the aerospace and automotive industry for critical high-strength components. B-pillars and door beams being of particular interest to the automotive industry Refill friction stir spot welding (RFSSW) offers an attractive means of joining these difficult-to-weld alloys since bulk melting is avoided and no exit hole is left. In this stud...

The relationship between the tension developed during brief isometric contractions and the frequency and amplitude components of the surface EMG were recorded in 5 male subjects after immersion of their arms and legs in water at 24, 27, 34 and 37 deg. C. for 20 min. The muscles examined were the handgrip, biceps, quadriceps, and gastrocnemius muscles. For the three warmest water temperatures, t...

The utilization of unbounded external reinforcing bars is one of the strengthening methods used after loading stage and before failure. The method has been used in different forms to strengthen members of reinforced concrete structures. To investigate the effect of utilization of post-tensioned reinforcing bars in this method of strengthening, a number of reinforced concrete beams was tested. S...

The effect of tension-tension fatigue (T-T) on carbon/epoxy composites (CFC) has been investigated in this paper. Load controlled fatigue tests were conducted in the tension-tension (T-T) cyclic mode with the R-ratio values of 0.1 and 0.3 and subsequently the specimens with the fatigue life over 10 cycles have been studied by means of tensile testing, ultrasonic inspection and quantitative data...

The new microplane model M6f for fiber reinforced concrete features several improvements over the earlier versions: (i) An explicit volumetric-deviatoric split to no split transition formulation in tension which eliminates spurious contraction under tension that the earlier models suffered; (ii) tension-compression load cycles are now correctly simulated using the loading/unloading rules prescr...

During design and winding of superconducting magnets at room temperature, a pre-tension under different rate is always applied to improve the mechanical stability of the magnets. However, an inconsistency rises for superconductors usually being sensitive to strain and oversized pre-stress which results in degradation of the superconducting composites' critical performance at low temperature. Th...

The interplay between passive and active mechanical properties of indirect flight muscle of the waterbug (Lethocerus) was investigated. A functional dissection of the relative contribution of cross-bridges, actin filaments, and C filaments to tension and stiffness of passive, activated, and rigor fibers was carried out by comparing mechanical properties at different ionic strengths of sarcomere...