Research: Assessment of testing protocols for bamboo for tension parallel to the fiber

Ever wondered how structural-grade bamboo properties are tested?
Recently, BASE and De La Salle University have a paper published in the Japanese journal “International Journal of Geomate” entitled the “Assessment of testing protocols for bamboo for tension parallel to the fiber.”
The study compared three different test methods (ISO 22157, the Pittsburgh method, and a modified ASTM D143) for tension parallel to grain to identify which one is the most viable for testing the tensile strength of bamboo. Through the comparison of success rate, test duration, load rate and transmission, specimen preparation, equipment fabrication, and execution of the three protocols, Base and La Salle researchers were able to identify Modified ASTM D143 as having the highest success rate during testing, lowest testing duration and being the easiest to execute.
The study further concludes that though ASTM D143 requires careful and meticulous preparation of the specimen, it provides the most consistent results with the lowest confidence interval. ISO 22157 comes second based on the success rate, test duration, and specimen preparation. Finally, the least recommended method is the Pittsburgh method. It produced the lowest success rate, with non-tension failures even higher than tension failures, and demanded a longer test duration and tedious specimen preparation.