One accepted cause that generates low mechanical strength and/or fracture properties is the presence of defects in the structure of the material. Additive Manufacturing does not except this rule, especially the powder bed fusion technologies that relays on powder spreading through a mechanical blade or roller followed by laser sintering or melting. The paper presents experimental investigations on fracture properties of polyamide PA2200 samples obtained by selective laser sintering. The mode I critical energy release rate and mode I fracture toughness were determined in accordance to ASTM D 5528 – 01 for four sets of samples: one set without induced geometrical defects, and three other sets having interlayer and intralayer defects. The results consist of geometrical evaluation of the samples and error computing on one-hand and fracture properties on the other hand. In addition, a study on absorbed energy in the defect section of samples was conducted, leading to a direct correlation between the defect percentages (0.0%, 0.1%, 0.3% and 0.5%) and the absorbed energy.

产生低机械强度和/或断裂性能的一个公认原因是材料结构中存在缺陷。增材制造法没有例外，尤其是粉末床熔融技术，该技术通过机械刀片或辊子传播粉末，然后进行激光烧结或熔化来继续进行粉末喷涂。本文介绍了通过选择性激光烧结获得的聚酰胺PA2200样品的断裂性能的实验研究。根据ASTM D 5528 – 01，针对四组样品确定了I型临界能量释放速率和I型断裂韧性：一组没有诱导的几何缺陷，另外三组具有层间和层内缺陷。结果包括样品的几何评估和一方面的误差计算，另一方面包括断裂特性。另外，对样品的缺陷部分中的吸收能量进行了研究，导致缺陷百分比（0.0％，0.1％，0.3％和0.5％）与吸收能量之间存在直接相关性。