Impact

StressThe load applied per unit area of material. Often expressed as pounds of force per square inch (psi). in a structure caused by the force of a vibratory, dropping,, or moving loads. This is generally a percentage of the live load.

Impact Machines

A type of machine that pierces the earth (piercing tool) or rams an object to produce a bore (ramming machine).

Impact Moling

Method of creating a bore using a pneumatic or hydaulic hammer within a casing, generally of torpedo shape. The term is usually associated with non-steered or limited steering devices without rigid attachment to the launch pit, relying upon the resistance of the ground for forward movement. During the operation the soil is displaced, not removed. An unsupported bore may be formed in suitable ground, or a pipe drawn in, or pushed in, behind the impact moling tool. Cables may also be drawn in.

Impact Ramming

See Pipe RammingA trenchless installation method whereby a percussive hammer is attached, via an adapter, to an open-end casing, which is then driven through the ground. To create an open casing, the spoils within the casing are removed after the drive is completed, or periodically during the drive..

Impact Strength

The ability of a material to withstand shock loading.