Change of Frequency Following Ultra-Sonic Fatigue and Ultra-Sonic Fatigue Test under Mean Stress

Sonic Infrared Imaging of Fatigue Cracks

Minimally invasive dentistry using sonic and ultra-sonic devices in ultraconservative Class 2 restorations.

AIM Within the context of minimally invasive dentistry this article describes the sonic and ultrasonic cavity preparation techniques and assesses their advantages and disadvantages, clinical difficulties of their use, and offers a statement about these devices. BACKGROUND Ultra-conservative Class 2 restorative techniques require the use of devices such as sonic and the new ultrasonic preparat...

Sonic Fatigue Study of an Aircraft Flap like Structure

Acoustic fatigue failures in aircraft are caused by the dynamic response of structures to unsteady pressure loading from aerodynamic and engine acoustic sources. Structural life is difficult to assess accurately and maybe affected by steady, thermal, in-plane and out-of-plane panel loads. These failures result in increased maintenance and inspection burdens associated with the operation of the ...

Simultaneous Application of Static and Dynamic Loads on Sonic Fatigue Test Articles

^^ A theory of acou.tlc fatlgu« !• propo««l which U b«.«d on a gene»! theory of fatigue of metal.. The theory 1« bated on the propo.ltlon that the problea la better under.tood If attention it focuted on the growth of the crack which it re.pon.lble for the ultimate failure. One .Ignificant manner in which the pre.ent theory differ. fromother. 1. that it invoke, a .tree, dependent limiting condit...

Rolling Contact Fatigue in Ultra High Vacuum