Study on the Damage Constitutive Model of Sand Autoclaved Aerated Concrete
QUAN Wenli1, HUAG Wei1,*, TANG Da1, SUN Wenbo2, MIAO Xinwei3, HOU Lina4
1 School of Civil Engineering, Xi'an University of Architecture & Technology, Xi'an 710055, China 2 Xi'an University of Architecture & Technology of South Australia An De College, Xi'an 710055, China 3 School of Science, Xi'an University of Architecture & Technology, Xi'an 710055, China 4 College of Architecture Engineering, Xi'an Technological University, Xi'an 710021, China
Abstract: To establish the uniaxial compressive damage constitutive model of sand autoclaved aerated concrete (SAAC), the stress-strain curves of SAAC under uniaxial monotonic and cyclic loading were obtained by experiment. Then the relationship between plastic strain and unloading point strain was analyzed, as well as the relationship between elastic energy and plastic dissipation energy. Subsequently, a damage variable was defined from the perspective of microelements strength, and then a damage constitutive model based on Weibull distribution was established, and the corresponding model parameters were conducted. Considering the stiffening effect of pore wall after compression, the effect of transmitting partial stress of micro element after its failure, and residual bearing capacity of the curve, a damage correction coefficient β and a damage threshold γ were introduced to modify this model. Meanwhile, considering the elastic and plastic damage, a damage variable was defined from the perspective of energy dissipation, an internal variable function for plastic free energy and elastic free energy were determined, and then from energy aspect, a damage constitutive model based on Weibull distribution was established. The model parameters were fitted based on experimental data. Finally, the damage evolution characteristics of the two models were compared. The results indicate that the two damage constitutive mo-dels are both in good agreement with the experimental results. However, the damage constitutive model based on energy is closer to the fact in the damage evolution and has clear physical significance.
权文立, 黄炜, 唐达, 孙文博, 苗欣蔚, 侯莉娜. 蒸压砂加气混凝土损伤本构模型研究[J]. 材料导报, 2025, 39(14): 24050166-6.
QUAN Wenli, HUAG Wei, TANG Da, SUN Wenbo, MIAO Xinwei, HOU Lina. Study on the Damage Constitutive Model of Sand Autoclaved Aerated Concrete. Materials Reports, 2025, 39(14): 24050166-6.
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2025, Vol. 39 
