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Dynamic flexural strength of Aluminosilicate glass with a perspective of impulsive and quasi-impulsive responses: An experimental-numerical coupled evaluation

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Chinese Journal of Aeronautics 2024年第12期37卷 388-403页

作者： Muhammad Aamir RAZA Tao SUo Uzair Ahmed dar Muhammad ATiF Muhammad Zakir SHEiKH School of Aeronautics and institute of Extreme Mechanics Northwestern Polytechnical UniversityXi’an 710072China Joint international Research Center of impact Dynamics and its Engineering Application Northwestern Polytechnical UniversityXi’an 710072China Shaanxi Key Laboratory of impact Dynamics and Engineering Application Northwestern Polytechnical UniversityXi’an 710072China National Key Laboratory of Strength and Structural integrity Northwestern Polytechnical UniversityXi’an 710072China

The flexural strength of glass is a critical design parameter for applications encountering impact ***,the micro defects,specimen geometry,loading rate,and load transformation from a quasi-dynamic to quasi-impulsive state may influence the measurement *** to the stochastic and amorphous nature of the material,an accurate determination of the flexural strength remains a *** this two-fold study,a coupled experimental-numerical strategy was devised to evaluate the dynamic flexural *** the first phase,three-point bending experiments were conducted on a novel“Electromagnetic Split Hopkinson Pressure bar(ESHPB)”.The incident stress signal and fracture time were recorded from experimental data,while the flexural strength was indirectly computed from a numerical algorithm.A quantitative comparison of the flexural strength with those in existing literature established the accuracy of the proposed *** of the study indicate that the specimen response became independent of the support conditions under impulsive *** being said,the specimen behaved like it had an infinite span length,and the measured flexural strength remained the same whether the specimen was supported or ***,the specimen also maintained contact at the interfaces of the incident bar and fixture supports for the entire loading *** the second part of this study,the computed flexural strength was used to calibrate the existing JH-2 *** prediction of the damage propagation corroborated with that obtained from reprography images,though *** work presents a precise and robust methodology to determine the dynamic flexural strength of brittle ceramics like Aluminosilicate glass over traditional experimental procedures to facilitate its adoption.

关键词： Dynamic flexural strength Damage mechanism Flexural fracture Numerical simulation Aluminosilicate glass

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The need for CoViD-19 research in lowand middle-income countries

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Global Health Research and Policy 2020年第1期5卷 175-178页

作者： Madhu Gupta Brian Wahl Binita Adhikari Naor bar-Zeev Sudip Bhandari Alexandra Coria Daniel J.Erchick Nidhi Gupta Shreya Hariyani EWangeci Kagucia Japhet Killewo Rupali Jayant Limaye Eric DMc.Collum Raghukul Pandey William S.Pomat Krishna D.Rao Mathuram Santosham Molly Sauer Rhoda K.Wanyenze David H.Peters Department of Community Medicine and School of Public Health Postgraduate Institute of Medical Education and ResearchMadhya MargSector 12Chandigarh 160012India Department of international Health Johns Hopkins Bloomberg School of Public HealthBaltimoreUSA international Vaccine Access Center Johns Hopkins Bloomberg School of Public HealthBaltimoreUSA Health Foundation Nepal KathmanduNepal Maimonides Medical Center New YorkUSA Epidemiology and Demography Department KEMRI-Wellcome Trust Research ProgrammeKilifiKenya Muhimbili University of Health and Allied Sciences Dar es SalaamTanzania Eudowood Division of Pediatric Respiratory Sciences Department of PediatricsJohns Hopkins School of MedicineBaltimoreUSA Papua New Guinea institute of Medical Research GorokaPapua New Guinea Makerere University School of Public Health KampalaUganda

in the early months of the pandemic,most reported cases and deaths due to CoViD-19 occurred in high-income ***,insufficient testing could have led to an underestimation of true infections in many low-and middle-income *** confirmed cases increase,the ultimate impact of the pandemic on individuals and communities in low-and middle-income countries is *** therefore propose research in three broad areas as urgently needed to inform responses in low-and middle-income countries:transmission patterns of SARS-CoV-2,the clinical characteristics of the disease,and the impact of pandemic prevention and response *** these questions will require a multidisciplinary approach led by local investigators and in some cases additional *** research activities should be done to help mitigate the potential burden of CoViD-19 in low-and middle-income countries without diverting the limited human resources,funding,or medical supplies from response activities.

关键词： CoViD-19 Research agenda Global health

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