Strain rate hardening: A hidden but critical mechanism for biological composites?

Chintapalli, Ravi Kiran; Breton, Stephanie; Dastjerdi, Ahmad Khayer; Barthelat, François

doi:10.1016/j.actbio.2014.08.027

Cited by 48 publications

(27 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Progressive tablet sliding and pull-out occurred from the combined hardening of the PU layer and the geometric hardening from the bowtie shape of the tablets. The observation of continuous spreading of the deformation despite a continuous decrease in applied stress could be an indication that strain rate hardening is operating at the interface [18], in addition to stiffening and geometric hardening. Because nonlinear deformation spread over the entire material, the measured strain and energy absorption can be considered representative of large materials made with the same microstructure.…”

Section: Inducing Geometric Hardening With Bowtie Tabletsmentioning

confidence: 99%

“…If, however, a crack propagates, powerful mechanisms such as crack deflection, bridging and process zone make propagation increasingly difficult and stabilize cracks, mitigating the effect of damage [9]. These inelastic deformation mechanisms propagate over large volumes thanks to the mechanical stability of the biopolymers at the interfaces, to the geometric hardening produced by waviness of the tablets [17] and to the strain rate hardening at the interface [18].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A laser-engraved glass duplicating the structure, mechanics and performance of natural nacre

Mirkhalaf¹,

Barthelat²

2015

Bioinspir. Biomim.

Self Cite

View full text Add to dashboard Cite

Highly mineralized biological materials such as nacre (mother of pearl), tooth enamel or conch shell boast unique and attractive combinations of stiffness, strength and toughness. The structures of these biological materials and their associated mechanisms are now inspiring new types of advanced structural materials. However, despite significant efforts, no bottom up fabrication method could so far match biological materials in terms of microstructural organization and mechanical performance. Here we present a new 'top down' strategy to tackling this fabrication problem, which consists in carving weak interfaces within a brittle material using a laser engraving technique. We demonstrate the method by fabricating and testing borosilicate glasses containing nacre-like microstructures infiltrated with polyurethane. When deformed, these materials properly duplicate the mechanisms of natural nacre: combination of controlled sliding of the tablets, accompanied with geometric hardening, strain hardening and strain rate hardening. The nacre-like glass is composed of 93 volume % (vol%) glass, yet 700 times tougher and breaks at strains as high as 20%.

show abstract

Section: Inducing Geometric Hardening With Bowtie Tabletsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A laser-engraved glass duplicating the structure, mechanics and performance of natural nacre

Mirkhalaf¹,

Barthelat²

2015

Bioinspir. Biomim.

Self Cite

View full text Add to dashboard Cite

show abstract

“…2(d)). Strain hardening may be beneficial to biological materials because the materials can undergo large deformation before failure (Chintapalli et al, 2014). This indicates that successive deformations can be accommodated by strain hardening in the ductile mode region prior to the occurrence of fracture but the material would become harder.…”

Section: Discussionmentioning

confidence: 97%

Nano-mechanical behaviour of lithium metasilicate glass–ceramic

Alao

Yin

2015

Journal of the Mechanical Behavior of Biomedical Materials

View full text Add to dashboard Cite

“…As evident from the stress-strain responses in figure 2, the scales undergo a form of strain hardening with deformation. Chintapalli et al [15,47] commented on this characteristic of biological composites, and that structural materials in Nature rely on strain hardening to maintain their functionality and tolerance to defects and damage. In most mineralized structural materials, the strain hardening response is restricted to the interfaces between highly mineralized components that are mediated by connective proteins.…”

Section: Discussionmentioning

confidence: 99%

Interfibril hydrogen bonding improves the strain-rate response of natural armour

Arola

Ghods

Son

et al. 2019

J. R. Soc. Interface.

View full text Add to dashboard Cite

Fish scales are laminated composites that consist of plies of unidirectional collagen fibrils with twisted-plywood stacking arrangement. Owing to their composition, the toughness of scales is dependent on the intermolecular bonding within and between the collagen fibrils. Adjusting the extent of this bonding with an appropriate stimulus has implications for the design of next-generation bioinspired flexible armours. In this investigation, scales were exposed to environments of water or a polar solvent (i.e. ethanol) to influence the extent of intermolecular bonding, and their mechanical behaviour was evaluated in uniaxial tension and transverse puncture. Results showed that the resistance to failure of the scales increased with loading rate in both tension and puncture and that the polar solvent treatment increased both the strength and toughness through interpeptide bonding; the largest increase occurred in the puncture resistance of scales from the tail region (a factor of nearly 7×). The increase in strength and damage tolerance with stronger intermolecular bonding is uncommon for structural materials and is a unique characteristic of the low mineral content. Scales from regions of the body with higher mineral content underwent less strengthening, which is most likely the result of interference posed by the mineral crystals to intermolecular bonding. Overall, the results showed that flexible bioinspired composite materials for puncture resistance should enrol constituents and complementary processing that capitalize on interfibril bonds.

show abstract

Strain rate hardening: A hidden but critical mechanism for biological composites?

Cited by 48 publications

References 32 publications

A laser-engraved glass duplicating the structure, mechanics and performance of natural nacre

A laser-engraved glass duplicating the structure, mechanics and performance of natural nacre

Nano-mechanical behaviour of lithium metasilicate glass–ceramic

Interfibril hydrogen bonding improves the strain-rate response of natural armour

Contact Info

Product

Resources

About