This next generation tensile test method will complement traditional tensile test method for polymer parts (e.g., ASTM D412 Types A-F) to accurately characterize mechanical properties of vat photopolymerization additively manufactured parts that are comprised of lattice structures to represent structures that are not 100% dense polymer. 1.2 Units- The values stated in SI units are to be regarded as standard. 1.3 This standard does not purport to address all safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
vat photopolymerization; additive manufacturing; lattice; dogbone; tensile test method; heterogeneity
Current ASTM tensile test methods do not adequately represent structures fabricated via vat photopolymerization because they assume the material is dense and has homogeneous mechanical properties, which is not the case due to inhomogeneities induced by the printing process. As vat photopolymerization continues to grow in market share of polymer additive manufacturing technologies, creating this proposed test method is necessary. The end users range from companies using vat photopolymeization for regenerative medicine to government agencies and academics developing high-performance materials who need a representative ASTM standard mechanical test method to reference.
The title and scope are in draft form and are under development within this