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Stress distribution variations during nanoindentation failure of hard coatings on silicon substrates

Nanotechnology and Precision Engineering 2023年第4期6卷 1-10页

作者： ritambhara dash Kushal Bhattacharyya Arnab S.Bhattacharyya Department of Metallurgical and Materials Engineering Central University of JharkhandRanchi 835205India Department of Mechanical Engineering Netaji Subhash Engineering CollegeKolkata 700152India Centre of Excellence in Green and Efficient Energy Technology(CoE GEET) Central University of JharkhandRanchi 835205India

Regarding quality inspection of technologically important nanocomposite hard coatings based on Ti,B,Si,C,and N and bioceramics such as hydroxyapatite that are used in small-scale high-precision devices and bio-implants,it is essential to study the failure mechanisms associated with nanoindentation,such as fracture,delamination,and *** stress imposed by the indenter can affect the fracture morphology and the interfacial fracture energy,depending on indenter shape,substrate type,crystallographic properties,pre-existing flaws,internal microcracks,and *** here are finite-element-based fracture studies that provide insights into the different cracking mechanisms related to the aforementioned failure process,showing that the fracture morphology is affected by the interaction of different cracking *** interfacial fracture energy,toughness,and residual stress are calculated using existing models with minor adjustments,and it is found that increasing the indenter sharpness improves the shear stress distribution,making the coating more prone to *** on the prevailing type of stress,the stress distribution beneath the depression results in either crack formation or a dislocation pile-up leading to strain *** forms of resistances resulting from the indentation process are found to affect the tip–sample conduction,and because of its stronger induced plasticity than that of a Berkovich indenter tip,a sharper cube-corner tip produces more resistance.

关键词： Nanoindentation Hard film Finite-element analysis(FEA) Cracking mechanism Stress

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A Single Arm, Monocentric, Prospective, Open Label Study to Evaluate Anti-Ageing Efficacy of Human Growth Factors and Cytokines Containing Cosmetic Skin Serum in Indian Female Population

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Journal of Cosmetics, Dermatological Sciences and Applications 2017年第1期7卷 118-132页

作者： Mukta Sachdev Anoop Chullikana Raviraja N. Seetharam Rachana Shilpakar R. Sapna Keerthi Velugotla ritambhara Anish S. Majumdar Pawan Kumar Gupta Manipal Hospital Bangalore India MS Skin Centre Bangalore India Stempeutics Research Pvt. Ltd. Bangalore India

Introduction: The use of growth factors and cytokines in skin rejuvenation and reversal of photo ageing is a novel anti-ageing treatment. These factors provide a microenvironment that seems to favor tissue repair and regeneration. Methods: An open label, monocentric, single arm study to evaluate anti-ageing efficacy of conditioned medium obtained from adult human bone-marrow derived allogenic mesenchymal stromal cells (BMMSC) along with excipients formulated into a cosmetic serum, was conducted in 40 Indian female population aged 35 to 60 years, belonging to skin type IV - VI of Norwood Scale for a duration of 90 days. Parameters—fine lines, wrinkles, crow’s feet, evenness of skin tone, skin firmness/laxity, hydration of skin, homogeneity of age spots, and visible pores were used to evaluate the anti-ageing and rejuvenating properties of the test product. Results and Discussion: Improvement was seen in majority of parameters starting from 15 - 30 days. Product was safe and well tolerated as per the dermatologist and subjects’ self-assessment.

关键词： Cytokines Conditioned Media Crow’s Feet Anti-Ageing

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