Search results
Results from the WOW.Com Content Network
Tear resistance (or tear strength) is a measure of how well a material can withstand the effects of tearing. [1] It is a useful engineering measurement for a wide variety of materials by many different test methods .
In this state, the crack will propagate by successive cleavage of the grains. At these low temperatures, the yield strength is high, but the fracture strain and crack tip radius of curvature are low, leading to a low toughness. [8] At higher temperatures, the yield strength decreases, and leads to the formation of the plastic zone.
Unlike a cut, which is generally on a straight or patterned line controlled by a tool such as scissors, a tear is generally uneven and, for the most part, unplanned. An exception is a tear along a perforated line , as found on a roll of toilet paper or paper towels , which has been previously partially cut, so the effort of tearing will ...
Tearing strength is the ability of the paper to withstand any tearing force without break. It is useful to evaluate web runability, controlling the quality of newsprint and characterizing the toughness of packaging paper. Tear strength for paper is measured in units of force, frequently measured with the Elmendorf Tester.
The relevant information is the area of the material being sheared, i.e. the area across which the shearing action takes place, and the shear strength of the material. A round bar of steel is used as an example. The shear strength is calculated from the tensile strength using a factor which relates the two strengths.
The second unusual property of the drops, namely the strength of the heads, is a direct consequence of large compressive residual stresses — up to 700 megapascals (100,000 psi) — that exist in the vicinity of the head's outer surface. [2]
Imagine sitting at your desk, trying to get work done, but you don't feel quite like your usual self. You feel exhausted, irritable, and distracted. You're not lazy or a bad employee: You might ...
Fracture mechanics is the field of mechanics concerned with the study of the propagation of cracks in materials. It uses methods of analytical solid mechanics to calculate the driving force on a crack and those of experimental solid mechanics to characterize the material's resistance to fracture.