The influence of lay-up lap size on composite material laminate repair

Damage is inevitable during the operation process of civil aircraft, composite material repair technology has been widely used in civil aviation.The repair parameters have an important effect on the reliability of the composite materials. Thus, in this paper, the laminates have been mending by different argument, and the influences of the lay-up lap size on failure strength, toughness, strain and measurement uncertainty on laminates has been investigated. The results shown that, with increased lay-up size, samples’ failure strength and measurement uncertainty was increased, toughness was decreased, the strain change tend of all samples was non repair area> edge of repair area> center of the repair area.