To investigate erosion phenomena, two different equipments have been developed. Equipment (i) projects high speed small diameter liquid jets at 450 to 800 m/sec and equipment (ii) projects 50 mm diameter low velocity jets at a speed of up to 46 m/sec.

The formation and development of erosion craters are examined, criteria are obtained for threshold velocities for single and multiple impacts and the relationships of jet velocity to the induction period and rate of mass loss are derived. The effects of impact against surfaces of varying roughness and also chromium plated, anodised and shot peened surfaces are studied and the influence on erosion characteristics are considered.

Experiments on targets subjected to uniaxial and biaxial tensile and compressive stresses are described and some analysis is given.

Damage resulting from jet impact on convex, concave and flat inclined surfaces is reported on and the essential features are analysed in terms of stress wave phenomena. Penetration of large blocks of material and the perforation of thin plates by water jets have been investigated.

The large diameter jet was used in conjunction with a pressure cell to determine the stresses engendered during impact on perpendicular and inclined surfaces and novel and unexpected results are found and are reported.