硅酸铝喷雾干燥粉末冷压弹塑性响应的实验研究
Experimental investigation of the elastoplastic response of aluminum silicate spray dried powder during cold compaction
摘要：
设计并进行了力学实验，以研究由用于瓷砖生产的硅酸铝喷雾干燥粉末形成的生坯的弹塑性行为。实验已执行的样品从冷压成圆柱形模具，包括：单轴应变，等双轴弯曲和高压三轴压缩/拉伸试验。两种类型的粉末已被用来实现生坯样品，不同的水含量的值，这已被视为等于那些通常采用的工业成型的传统陶瓷。在压实过程中的生坯屈服的特点是屈服面形状，故障包络线，并与成形压力的凝聚力和孔隙比的演变，确认先前提出的本构模型的有效性，通过冷压颗粒获得的致密材料。
英文摘要：
Mechanical experiments have been designed and performed to investigate the elasto-plastic behaviour of green bodies formed from an aluminum silicate spray dried powder used for tiles production. Experiments have been executed on samples obtained from cold compaction into a cylindrical mould and include: uniaxial strain, equi-biaxial flexure and high-pressure triaxial compression/extension tests. Two types of powders have been used to realize the green body samples, differing in the values of water content, which have been taken equal to those usually employed in the industrial forming of traditional ceramics. Yielding of the green body during compaction has been characterized in terms of yield surface shape, failure envelope, and evolution of cohesion and void ratio with the forming pressure, confirming the validity of previously proposed constitutive models for dense materials obtained through cold compaction of granulates.
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