مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

Experimental Assessment of Fracture in Rigid Nanocomposite Foams Weakened by a Pre-Crack in Mixed-Mode I/II

نوع مقاله : مقاله پژوهشی

نویسندگان
Mohammad Mahdi Touiserkani 1
Mahdi Heydari Meybodi 2
1 Department of Mechanical Engineering, Yazd University, Yazd, Iran.
2 Department of Mechanical Engineering, Yazd University, Yazd, Iran
10.48311/mme.2025.96909.0
چکیده
Rigid nanocomposite foams reinforced with nanoclay have low density and high mechanical strength. Additionally, they offer improved thermal and fracture properties, making them attractive for advanced structural applications. This study, examines the effect of nanoclay content (0, 1, 2, and 3 wt%) on the mechanical and fracture behavior of rigid Polyurethane (PUR) foams under mixed-mode I/II loading. The samples are produced using ultrasonic dispersion and subjected to uniaxial tensile and fracture experiments with Asymmetric Edge Notch Disc Bend (AENDB) specimens. Fracture toughness and stress intensity factors are analyzed using Finite Element Modeling (FEM). The results show that adding up to 2 wt% of nanoclay enhances tensile and fracture resistance, while 3 wt% reduces strength due to nanoparticle agglomeration. Significantly, the specimen with 2 wt% of nanoclay shows the best performance, with about 35% increase in tensile strength, 25% in fracture displacement, and up to 32% improvement in fracture load under Mixed-Mode I/II conditions. In contrast, the 3 wt% sample exhibits reductions of about 18% in tensile properties and 16% in mixed-mode fracture load. These findings highlight the importance of optimizing nanoclay concentration to achieve superior fracture performance in rigid PUR foams
کلیدواژه‌ها
Nanocomposite
Nanoclay
PUR Foam
Mixed-Mode I/II Fracture
Finite Element Modeling

موضوعات

عنوان مقاله English

Experimental Assessment of Fracture in Rigid Nanocomposite Foams Weakened by a Pre-Crack in Mixed-Mode I/II

نویسندگان English

Mohammad Mahdi Touiserkani 1
Mahdi Heydari Meybodi 2
1 Department of Mechanical Engineering, Yazd University, Yazd, Iran
2 Department of Mechanical Engineering, Yazd University, Yazd, Iran
چکیده English

Rigid nanocomposite foams reinforced with nanoclay have low density and high mechanical strength. Additionally, they offer improved thermal and fracture properties, making them attractive for advanced structural applications. This study, examines the effect of nanoclay content (0, 1, 2, and 3 wt%) on the mechanical and fracture behavior of rigid Polyurethane (PUR) foams under mixed-mode I/II loading. The samples are produced using ultrasonic dispersion and subjected to uniaxial tensile and fracture experiments with Asymmetric Edge Notch Disc Bend (AENDB) specimens. Fracture toughness and stress intensity factors are analyzed using Finite Element Modeling (FEM). The results show that adding up to 2 wt% of nanoclay enhances tensile and fracture resistance, while 3 wt% reduces strength due to nanoparticle agglomeration. Significantly, the specimen with 2 wt% of nanoclay shows the best performance, with about 35% increase in tensile strength, 25% in fracture displacement, and up to 32% improvement in fracture load under Mixed-Mode I/II conditions. In contrast, the 3 wt% sample exhibits reductions of about 18% in tensile properties and 16% in mixed-mode fracture load. These findings highlight the importance of optimizing nanoclay concentration to achieve superior fracture performance in rigid PUR foams

کلیدواژه‌ها English

Nanocomposite
Nanoclay
PUR Foam
Mixed-Mode I/II Fracture
Finite Element Modeling
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مهندسی مکانیک مدرس
دوره 25، شماره 11
آبان 1404
صفحه 717-724