The fracture toughness of reinforced polyurethane foam

Cotgreave, T.; Shortall, J. B.

doi:10.1007/bf00570506

Cited by 26 publications

(15 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus, the fibers in the phenolic foams alter the mode of cracks growth and result in higher bending fracture toughness. This phenomenon is similar to the observations of Cotgreave and Shortall on short glass fibers in polyurethane foams . However, too many short glass fibers cannot do good to the bending property of phenolic foams, because when fractured, foams are damage and cracking due to glass fiber's pullout, as Fig.…”

Section: Resultssupporting

confidence: 87%

Mechanical characterization of phenolic foams modified by short glass fibers and polyurethane prepolymer

Yang

2014

Polymer Composites

View full text Add to dashboard Cite

Short glass fibers and polyurethane prepolymer were used to modify phenolic foams. The mechanical properties of the composites were characterized and compared with those of foams unmodified and modified with only polyurethane prepolymer or short glass fibers in terms of friability, compression, and bending properties. It shows that polyurethane prepolymer significantly improved the toughness and reduced the friability of phenolic foams, while short glass fibers markedly increased the compression and bending properties. The compound modified foams exhibited significantly lower friability and higher resistance to cracking behavior than conventional phenolic foams and the foams modified with only short glass fibers, and were much stiffer and stronger than conventional phenolic foams and the foams modified with only polyurethane prepolymer. The compound modified phenolic foams with the 1:3 ratio of short glass fibers to polyurethane prepolymer exhibited excellent integrated mechanical properties. POLYM. COMPOS., 36:1584-1589, 2015

show abstract

Section: Resultssupporting

confidence: 87%

Mechanical characterization of phenolic foams modified by short glass fibers and polyurethane prepolymer

Yang

2014

Polymer Composites

View full text Add to dashboard Cite

show abstract

“…Cotgreave and Shortall 126 presented one of the first investigation to improve the fracture toughness of rigid closed cell PUR foam, by reinforcing with CGFs. The incorporation of GFs provides an extension of the natural toughening mechanism, arising from microstructural features that provide for multiple arrests and diversions to occur along the path of a propagating crack.…”

Section: Improving Fracture Toughness By Reinforcing the Foamsmentioning

confidence: 99%

Fracture toughness of rigid polymeric foams: A review

Marșavina

Linul

2020

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

Polymeric foams have good capacity of absorbing energy in compression but are brittle in tension. Linear elastic fracture mechanics is successfully applied to assess the integrity of polymeric foam-based composite structures. The fracture toughness represents an important parameter. The different approaches to estimate the fracture toughness of polymeric foams are reviewed: analytical and numerical micromechanical models and experimental investigations. Focus is given on the parameters influencing the fracture toughness of polymeric foams like specimen type, solid material, density, loading speed, size effect and temperature. Data on mixed-mode loading and dynamic fracture toughness are also presented. The last part of the paper presents some results to increase the fracture toughness by reinforcing of polymeric foams.

show abstract

“…For low aspect ratio particles, models have been proposed where the particles are embedded within and reinforce the cell walls. Examples include short glass fibres and beads [12] and micro-crystalline cellulose (MCC) [13]. For models with particles larger than the cell walls, the entire foam cell structure was treated as a homogeneous matrix reinforced by embedded particles [11,14,15].…”

Section: Modelling Composite Foam Stiffnessmentioning

confidence: 99%

Improving and predicting the mechanical properties of foamed and stretched composite poly(lactic acid) films

Hussain¹,

Dickson²

2019

Express Polym. Lett.

View full text Add to dashboard Cite

Foamed poly(lactic acid) films reinforced with micro-crystalline cellulose (MCC), were uniaxially stretched to different ratios. At 10% (weight) loading MCC particles gave an approximately 3.5 times improvement in stiffness over unreinforced foams. X-ray tomography and image analysis showed that most MCC particles had low aspect ratios, were randomly oriented and well distributed. Stretching did not change the orientation of the MCC particles. Increases in stiffness with stretching were due to the alignment of the foam cell walls. Electron microscopy and image analysis showed that the foam cells were elongated and the walls aligned in the stretch direction. There was a good fit between measured stiffness and micro-mechanical modelling based on a variation of the Mori-Tanaka model for reinforcing particles randomly oriented in 3 dimensions.

show abstract

The fracture toughness of reinforced polyurethane foam

Cited by 26 publications

References 10 publications

Mechanical characterization of phenolic foams modified by short glass fibers and polyurethane prepolymer

Mechanical characterization of phenolic foams modified by short glass fibers and polyurethane prepolymer

Fracture toughness of rigid polymeric foams: A review

Improving and predicting the mechanical properties of foamed and stretched composite poly(lactic acid) films

Contact Info

Product

Resources

About