Anisotropic, rate-dependent ductile fracture of Ti-6Al-4V alloy

An extensive experimental campaign was run to investigate the influence of the loading direction, stress state (triaxiality ratio ranging from −0.5 to 1), and strain rate (from 10−3 to 1.5x103s−1) on the ductile fracture of Ti-6Al-4V titanium alloy. Microscopic and macroscopic observations provided some insight into the shear-driven or micro-voiding-controlled damage mechanisms prevailing at low and high triaxiality ratios, respectively. Numerical simulations were run to determine the local loading paths to fracture in terms of plastic strain as a function of stress triaxiality ratio and Lode parameter. The ductility was found to be anisotropic, but only weakly dependent on the strain rate in the considered range. The anisotropy in ductility was different in tension (maximum along DD) and in compression (maximum along ND). The fracture strain decreased with the absolute value of the triaxiality, with a maximum close to zero. No clear correlation with the Lode parameter was found.

Analysis of A Cable Loaded Uniformly Along the Horizontal Using MATLAB

Cables can be defined as a flexible structure which can only support tensile load and offers no resistance when compressed or bent in a curved shape. They have several applications in engineering structures for supporting and transmitting load form one point to another such as bridges, trolley wheels, supports suspension roofs and main load carrying cables in any structure. Hence it becomes necessary for extensive design and analysis study on cables. Therefore in the present paper work, cable of length 600m is uniformly loaded along the horizontal is been considered for the analysis with the mass of 18kg/m of its length and supports its own weight. The aim of the work is to determines mid length tension, maximum tension and total cable length for h= 10, 20, 30, 40, 50, 60, 70 and 80 meters using MATLAB. The result shows that as h increases, the tension in mid length and maximum tension is decreasing, whereas total length of the cable is found increasing.

On the Inflated Tire Profile: Inflation and Axial Compression of a Composite, Initially Cylindrical Membrane

The analysis for the inflation of bias tires, based on the model of the net of inextensible cords, is reformulated in terms of bead point coordinates and the cross angle of cords in the initially cylindrical membrane. A simple numerical method of solution is described. An exact solution in a special case is given. Computations are presented for maximum cord tension, maximum cord-rubber shear stress, and bead tension.

Effects of stretch on tension development in frog atrium

Initial tension, isometric contractile tension, and the first derivative of the contractile response were recorded from the atrial wall of frog hearts. These hearts were stretched progressively from 0 to 25 g of initial tension at 25 C. Maximum peak isometric tension, maximum rate of tension development, and maximum rate of relaxation were attained at the relatively low stretching force of 2 g and at a 50% increase in length. Peak contractile tension remained near maximum under high initial tension, but the maximum rates of contraction and relaxation were markedly decreased. Stress relaxation was apparent in all preparations at all levels of initial tension. It appears to represent an alteration of the internal tension mechanism different from the alteration which accompanies the increase or decrease of the stretching force.