Analysis of crack opening behaviour by application of a discretised strip yield model

The crack opening behaviour of a fatigue crack in a centrally cracked panel was studied using a discretised version of the Dugdale and Barenblatt model. The effect of crack growth was also included. Results obtain ed for constant amplitude loading were in agreement with data reported in the open literature. The effect of application of single...

Final report on a research facility for critical point phenomena in microgravity

A conceptual design for a research facility for critical point phenomena in Spacelab's microgravity environment is presented. In the critical point facility (CPF) four experiments can be performed in parallel. The CPF consists of five parts: four experiment units and a service module. The experiment units offer the user-provided (instrumented)...

Design and Implementation of the Delft Image Processor DIP-1

This report describes the design and implementation of the Delft Image Processor DIP-1. In this pipelined image-processing computer, a number of storage and processing modules which operate concurrently and synchronously (hardware floating-point ALUs and multiplier, conversion table and cellularlogic table) may be interconnected in a...

Study on equipment requirements in support of microgravity fluid physics experiments

The study culminates in requirements for facilities and instrumentation of a laboratory supporting microgravity fluid physics experiments and equipment developments. The requirements are based on reviews of candidate areas of experimentation and proposed or actual experiment facilities. Present deficiencies in measurement capabilities or...

Rate effects on residual strength of flawed structures and materials

The literature is reviewed with respect to: - tests conducted to investigate crack re-initiation under dynamic load and arrest of a running crack - metallurgical sources of rate effects - available data for aerospace engineering materials - mechanical sources of rate effects, i.e. dynamic crack tip stresses and kinetic energy effects Conclusions...

The incremental solution of some basic problems in elastic stability

Accuracy of attitude control systems for satellites using double gimballed momentum wheels