Resistance of grain boundary array to cleavage cracking in free-standing thin film

Chen, Jin; Lu, Weiyi; Qiao, Yu

doi:10.1016/j.mechmat.2008.10.006

Cited by 5 publications

(1 citation statement)

References 34 publications

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“…The specific role of GBs in affecting cleavage crack growth resistance has not yet been completely clarified. However, recent studies by Qiao [44], Qiao & Argon [45], Qiao & Kong [46], Chen et al [47] and Lu et al [48] should be mentioned.…”

Section: Influence Of Grain Boundaries In Cleavage Fracture (A) Introduction: Materialsmentioning

confidence: 94%

Crossing grain boundaries in metals by slip bands, cleavage and fatigue cracks

Pineau

2015

Phil. Trans. R. Soc. A.

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The size and the character (low and large angle, special boundaries, tilt and twist boundaries, twins) of the grain boundaries (GBs) in polycrystalline materials influence their strength and their fracture toughness. Recent studies devoted to nanocrystalline (NC) materials have shown a deviation from the Hall-Petch law. Special GBs formed by Σ3 twins in face-centred cubic metals are also known to have a strong effect on the mechanical behaviour of these metals, in particular their work-hardening rate. Grain orientation influences also crack path, the fracture toughness of body-centred cubic (BCC) metals and the fatigue crack growth rate of microstructurally short cracks. This paper deals both with slip transfer at GBs and with the interactions between propagating cracks with GBs. In the analysis of slip transfer, the emphasis is placed on twin boundaries (TBs) for which the dislocation reactions during slip transfer are analysed theoretically, experimentally and using the results of atomic molecular simulations published in the literature. It is shown that in a number of situations this transfer leads to a normal motion of the TB owing to the displacement of partial dislocations along the TB. This motion can generate a de-twinning effect observed in particular in NC metals. Crack propagation across GBs is also considered. It is shown that cleavage crack path behaviour in BCC metals is largely dependent on the twist component of the GBs. A mechanism for the propagation of these twisted cracks involving a segmentation of the crack front and the existence of intergranular parts is discussed and verified for a pressure vessel steel. A similar segmentation seems to occur for short fatigue cracks although, quite surprisingly, this crossing mechanism for fatigue cracks does not seem

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Section: Influence Of Grain Boundaries In Cleavage Fracture (A) Introduction: Materialsmentioning

confidence: 94%

Crossing grain boundaries in metals by slip bands, cleavage and fatigue cracks

Pineau

2015

Phil. Trans. R. Soc. A.

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A Fully Biodegradable and Ultra‐Sensitive Crack‐Based Strain Sensor for Biomechanical Signal Monitoring

Lee,

Bae,

Kim

et al. 2024

Adv Funct Materials

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A fully biodegradable, ultra‐sensitive, and soft strain sensor is pivotal for temporary, real‐time monitoring of microdeformations, crucial in disease diagnosis, surgical precision, and prognosis of muscular, and vascular conditions. Nevertheless, the strain sensitivity of previous biodegradable sensors, denoted by gauge factor (GF) up to ≈100, falls short of requirements for complex biomedical monitoring scenarios, specifically monitoring cardio‐cerebrovascular diseases with microscale variations in vascular surface strain. Here, a fully biodegradable, ultra‐sensitive crack‐based flexible strain sensor is introduced achieving GF of 1355 at 1.5% strain through integration of molybdenum (Mo) film, molybdenum trioxide (MoO3) adhesion layer, and polycaprolactone (PCL) substrate. Analysis of crack morphology of biodegradable thin‐film metals, including Mo, tungsten (W), and magnesium (Mg), reveals material‐dependent sensitivity and repeatability of crack‐based strain sensors. The effect of the adhesion layer and polymer substrate is also investigated. Overall morphological studies on the sensor present a comprehensive understanding of metal film cracking behavior and corresponding performance characterization, showing significant potential for highly sensitive sensors. A hybrid membrane composed of candelilla wax (Cw), beeswax (Bw), and polybutylene adipate‐co‐terephthalate (PBAT) is introduced to provide hydrophobic, yet flexible encapsulation. In vivo, short‐term (≈3 days) monitoring of vascular pulsatility underscores the potential of the sensing tool for rapid, accurate, and temporal disease diagnosis and treatment.

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Propagation of a cleavage crack front across a field of persistent grain boundaries

Chakravarthula

Chen

et al. 2012

International Journal of Solids and Structures

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Resistance of grain boundary array to cleavage cracking in free-standing thin film

Cited by 5 publications

References 34 publications

Crossing grain boundaries in metals by slip bands, cleavage and fatigue cracks

Crossing grain boundaries in metals by slip bands, cleavage and fatigue cracks

A Fully Biodegradable and Ultra‐Sensitive Crack‐Based Strain Sensor for Biomechanical Signal Monitoring

Propagation of a cleavage crack front across a field of persistent grain boundaries

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