The influence of biaxial strain ratio and strain range on crack growth mode and crack shape

Topper, T. H.; Bonnen, John; Khalil, M.; Varvani‐Farahani, A.

doi:10.1007/s10853-010-4928-z

Cited by 4 publications

(3 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Specifically, in tensile or compressive stage, the surface membrane can reasonably control slit width through absorbing strain energy with small deformation. The crack-shaped slit will propagate from the slit tip with the excessive opening and closure of the slit wake because of the high stress intensity at the slit tip [29,30]. Therefore, the surface membrane must protect the pre-existing mechanosensory slit through controlling the slit width within a safe threshold.…”

Section: Resultsmentioning

confidence: 99%

The Balance Strategy between Structural Safety and Sensing Accuracy Inspired by Slit-Based Mechanical Sensilla

et al. 2020

View full text Add to dashboard Cite

In engineering, cracks are typically regarded as defects due to enormous stress amplification at tip of the crack. Conversely, scorpion ingeniously utilizes the “risky” near-tip stress field of a crack-shaped slit to accurately detect weak vibration signal without causing catastrophic crack propagation from the slit tip. The present paper focuses on the balance strategy between structural safety and sensing accuracy of slit-based mechanical sensilla. We performed a detailed structural and mechanical property study of tissue around the slit wake utilizing a complementary combination of various experimental methods. The results indicate that there is a special thin surface membrane covering the slit wake and the elastic moduli of the membrane and exoskeleton are 0.562 GPa and 5.829 GPa, respectively. In addition, the ratio of bending stiffness between exoskeleton and membrane tissue is about 8 × 104. The theoretical and simulation analysis show that the surface membrane—with appropriate elastic modulus and bending stiffness—can achieve different forms of deformation with the change of slit width for protecting the mechanosensory structure without sacrificing the sensing accuracy. This finding offers a crucial theoretical basis for the further design of bionic mechanical sensors based on the near-tip stress field of artificial cracks.

show abstract

Section: Resultsmentioning

confidence: 99%

The Balance Strategy between Structural Safety and Sensing Accuracy Inspired by Slit-Based Mechanical Sensilla

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The LCF test data of SC nickel–based superalloy DD3 show that when the strain ratio are different, the discrepancy of the number of cycles to fatigue failure is about 3.6 times under the same strain range and crystallographic orientation test condition. Besides, it has been proven that strain ratio can cause a shear crack to initiate and grow until failure at the low strain …”

Section: Mechanism and Methodsmentioning

confidence: 99%

“…Besides, it has been proven that strain ratio can cause a shear crack to initiate and grow until failure at the low strain. 35 As mentioned above, the normal strain amplitude Δε n is also an important influencing parameter on fatigue life. Therefore, comprehensively considering the effects of normal strain amplitude and strain ratio, a new damage parameter normal strain ratio ε load /Δε n is proposed in the form of shear stress ratio τ load /Δτ max to reflect the effect of normal strain ratio.…”

Section: The Anisotropic Lcf Life Prediction Modellingmentioning

confidence: 98%

A modified normal strain ratio fatigue life model based on the hybrid approach of critical plane and crystallographic slip theory

Dong

Gao

et al. 2017

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

Based on the method combining the critical plane with crystallographic slip theory, an anisotropic low cycle fatigue life model is proposed to reflect the effects of orientation dependence and damage factors on fatigue life. According to this method, the crystallographic slip plane is adopted as the critical plane by searching for 30 potential slip systems. In addition, considering the effects of normal strain and strain ratio on fatigue failure, the normal strain ratio is introduced into model and regression model is obtained by fitting method. The proposed model is verified by estimating the low cycle fatigue lives of single crystal nickel–based superalloys PWA1480, CMSX‐2 and DD3 for different loading conditions. The results show that the proposed model is applicable for more complicated loading situations and give a higher prediction accuracy compared to Sun's model.

show abstract

Localized strain profile in surface electrode array for programmable composite multiferroic devices

Xiao

Lai

Zheng

et al. 2021

Applied Physics Letters

View full text Add to dashboard Cite

We investigate localized in-plane strains on the microscale, induced by arrays of biased surface electrodes patterned on piezoelectrics. Particular focus is given to the influence that adjacent electrode pairs have on one another to study the impact of densely packed electrode arrays. We present a series of X-ray microdiffraction studies to reveal the spatially-resolved micron-scale strain distribution. The strain maps with micron-scale resolution highlight how the local strain

show abstract

The influence of biaxial strain ratio and strain range on crack growth mode and crack shape

Cited by 4 publications

References 10 publications

The Balance Strategy between Structural Safety and Sensing Accuracy Inspired by Slit-Based Mechanical Sensilla

The Balance Strategy between Structural Safety and Sensing Accuracy Inspired by Slit-Based Mechanical Sensilla

A modified normal strain ratio fatigue life model based on the hybrid approach of critical plane and crystallographic slip theory

Localized strain profile in surface electrode array for programmable composite multiferroic devices

Contact Info

Product

Resources

About