Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Biot’s Coefficient Estimation for a Substrate Clay Material in Historical Wall Paintings Using Humidity-Induced Strain
https://orcid.org/http://orcid.org/0000-0002-6553-181X
https://orcid.org/http://orcid.org/0000-0003-0376-1465
https://orcid.org/http://orcid.org/0000-0002-7179-0068
https://orcid.org/http://orcid.org/0009-0000-1760-7712
By clarifying the allowable hygrothermal environment for the conservation of cultural artifacts, it is possible to prevent artifact deterioration and reduce energy consumption for environmental control. Therefore, predicting the deterioration of cultural artifacts is required. This study focused on mechanical damage to hygroscopic materials induced by humidity fluctuations. The damage is caused by the stress resulting from constrained deformation during drying/wetting. Poroelasticity is a model that explains the mechanical behavior of porous materials caused by pore pressure changes. This model incorporates pore pressure change into the stress-strain relationship of an elastic solid body, which requires a poromechanical elastic modulus for stress prediction. In this study, we measured Biot’s coefficient, a poromechanical elastic modulus, of mock-up white clay, which simulated the substrate layer of Hiten wall paintings at the main hall of Horyu-ji Temple. Conventional Biot’s coefficient measurement requires a triaxial test in which the material is saturated with water. However, white clay is a clay, paper fiber, and rice glue mixture, and is difficult to immerse in water. Therefore, we attempted to estimate Biot’s coefficient using the humidity-induced strain and pore pressure changes. Several white clay compositions were tested, and the resulting Biot’s coefficients ranged from 0.038 to 0.144(-). The methods and findings of this study could provide valuable insights for damage prediction of cultural artifacts containing clay materials, such as wall paintings in East Asia, including Hiten wall paintings.
Biot’s Coefficient Estimation for a Substrate Clay Material in Historical Wall Paintings Using Humidity-Induced Strain
https://orcid.org/http://orcid.org/0000-0002-6553-181X
https://orcid.org/http://orcid.org/0000-0003-0376-1465
https://orcid.org/http://orcid.org/0000-0002-7179-0068
https://orcid.org/http://orcid.org/0009-0000-1760-7712
By clarifying the allowable hygrothermal environment for the conservation of cultural artifacts, it is possible to prevent artifact deterioration and reduce energy consumption for environmental control. Therefore, predicting the deterioration of cultural artifacts is required. This study focused on mechanical damage to hygroscopic materials induced by humidity fluctuations. The damage is caused by the stress resulting from constrained deformation during drying/wetting. Poroelasticity is a model that explains the mechanical behavior of porous materials caused by pore pressure changes. This model incorporates pore pressure change into the stress-strain relationship of an elastic solid body, which requires a poromechanical elastic modulus for stress prediction. In this study, we measured Biot’s coefficient, a poromechanical elastic modulus, of mock-up white clay, which simulated the substrate layer of Hiten wall paintings at the main hall of Horyu-ji Temple. Conventional Biot’s coefficient measurement requires a triaxial test in which the material is saturated with water. However, white clay is a clay, paper fiber, and rice glue mixture, and is difficult to immerse in water. Therefore, we attempted to estimate Biot’s coefficient using the humidity-induced strain and pore pressure changes. Several white clay compositions were tested, and the resulting Biot’s coefficients ranged from 0.038 to 0.144(-). The methods and findings of this study could provide valuable insights for damage prediction of cultural artifacts containing clay materials, such as wall paintings in East Asia, including Hiten wall paintings.
Biot’s Coefficient Estimation for a Substrate Clay Material in Historical Wall Paintings Using Humidity-Induced Strain
https://orcid.org/http://orcid.org/0000-0002-6553-181X
https://orcid.org/http://orcid.org/0000-0003-0376-1465
https://orcid.org/http://orcid.org/0000-0002-7179-0068
https://orcid.org/http://orcid.org/0009-0000-1760-7712
By clarifying the allowable hygrothermal environment for the conservation of cultural artifacts, it is possible to prevent artifact deterioration and reduce energy consumption for environmental control. Therefore, predicting the deterioration of cultural artifacts is required. This study focused on mechanical damage to hygroscopic materials induced by humidity fluctuations. The damage is caused by the stress resulting from constrained deformation during drying/wetting. Poroelasticity is a model that explains the mechanical behavior of porous materials caused by pore pressure changes. This model incorporates pore pressure change into the stress-strain relationship of an elastic solid body, which requires a poromechanical elastic modulus for stress prediction. In this study, we measured Biot’s coefficient, a poromechanical elastic modulus, of mock-up white clay, which simulated the substrate layer of Hiten wall paintings at the main hall of Horyu-ji Temple. Conventional Biot’s coefficient measurement requires a triaxial test in which the material is saturated with water. However, white clay is a clay, paper fiber, and rice glue mixture, and is difficult to immerse in water. Therefore, we attempted to estimate Biot’s coefficient using the humidity-induced strain and pore pressure changes. Several white clay compositions were tested, and the resulting Biot’s coefficients ranged from 0.038 to 0.144(-). The methods and findings of this study could provide valuable insights for damage prediction of cultural artifacts containing clay materials, such as wall paintings in East Asia, including Hiten wall paintings.
Biot’s Coefficient Estimation for a Substrate Clay Material in Historical Wall Paintings Using Humidity-Induced Strain
Lecture Notes in Civil Engineering
Berardi, Umberto (Herausgeber:in) / Ishikawa, Kazuki (Autor:in) / Ogura, Daisuke (Autor:in) / Iba, Chiemi (Autor:in) / Takatori, Nobumitsu (Autor:in) / Wakiya, Soichiro (Autor:in)
International Association of Building Physics ; 2024 ; Toronto, ON, Canada
14.12.2024
7 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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