P‐42: Novel Stress Profile for Chemically Strengthened Glass with High Drop Strength.

Hard turning, i.e., turning hardened steels, may produce the unique “hook” shaped residual stress (RS) profile characterized by surface compressive RS and subsurface maximum compressive RS. However, the formation mechanism of the unique RS profile is not yet known. In this study, a novel hybrid finite element modeling approach based on thermal-mechanical coupling and internal state variable plasticity model has been developed to predict the unique RS profile patterns by hard turning AISI 52100 steel (62 HRc). The most important controlling factor for the unique characteristics of residual stress profiles has been identified. The transition of maximum residual stress at the surface to the subsurface has been recovered by controlling the plowed depth. The predicted characteristics of residual stress profiles favorably agree with the measured ones. In addition, friction coefficient only affects the magnitude of surface residual stress but not the basic shape of residual stress profiles.

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Proposed Fracture Theory of a Dispersion-Strengthened Glass Matrix

Journal of the American Ceramic Society ◽

10.1111/j.1151-2916.1966.tb13210.x ◽

1966 ◽

Vol 49 (2) ◽

pp. 68-72 ◽

Cited By ~ 138

Author(s):

D. P. H. HASSELMAN ◽

R. M. FULRATH

Keyword(s):

Glass Matrix ◽

Strengthened Glass ◽

Fracture Theory

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Structural Equation Modeling of a Global Stress Index in Healthy Soldiers

Journal of Clinical Medicine ◽

10.3390/jcm10081799 ◽

2021 ◽

Vol 10 (8) ◽

pp. 1799

Author(s):

Tanja Maier ◽

Melanie Kugelmann ◽

Dae-Sup Rhee ◽

Sebastian Brill ◽

Harald Gündel ◽

...

Keyword(s):

Structural Equation Modeling ◽

Cardiovascular Risk ◽

Chronic Stress ◽

Structural Equation ◽

Hierarchical Level ◽

Stress Index ◽

Equation Modeling ◽

Stress Profile ◽

Acute And Chronic Stress ◽

Global Stress

Accumulation of stress is a prognostic trigger for cardiovascular disease. Classical scores for cardiovascular risk estimation typically do not consider psychosocial stress. The aim of this study was to develop a global stress index (GSI) from healthy participants by combining individual measures of acute and chronic stress from childhood to adult life. One-hundred and ninety-two female and male soldiers completed the Perceived Stress Scale (PSS4), Trier Inventory for Chronic Stress (TICS), Hospital Anxiety and Depression Scale (HADS), Childhood Trauma Questionnaire (CTQ), Posttraumatic Diagnostic Scale Checklist (PDS), and the Deployment Risk and Resilience Inventory (DRRI-2). The underlying structure for the GSI was examined through structural equation modeling. The final hierarchical multilevel model revealed fair fit by taking modification indices into account. The highest order had a g-factor called the GSI. On a second level the latent variables stress, HADS and CTQ were directly loading on the GSI. A third level with the six CTQ subscales was implemented. On the lowest hierarchical level all manifest variables and the DRRI-2/PDS sum scores were located. The presented GSI serves as a valuable and individual stress profile for soldiers and could potentially complement classical cardiovascular risk factors.

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