Construction method of secondary bonding joint of fiber reinf orced plastic pipe

In previous studies, the breaking behavior of secondary bonding joints has been considered very difficult to analyze, because of non-linearity. In this report, we suppose that the primary causes of this breaking behavior are interlamination decomposition, and joint breakage due to excessive pulling. These have been shown in our long term experiments to be the main failures of composite materials. We explain the simple analytical method used to promote material decomposition and present a practical construction method. Along with this, we raise problems relating to the construction technology employed, and possible solutions to these problems.