A predictive model for impact response of viscoelastic polymers in drop tests

1996 ◽  
Vol 35 (3) ◽  
pp. 252-264 ◽  
Author(s):  
Ronald G. Larson ◽  
Suresh Goyal ◽  
Charles Aloisio
Keyword(s):  
Predictive Model ◽  
Impact Response ◽  
Drop Tests

Could a Compliant Foam Anvil Characterize the Biofidelic Impact Response of Equestrian Helmets?

2020 ◽  
Vol 142 (6) ◽  
Author(s):  
J. Michio Clark ◽  
Thomas A. Connor ◽  
Andrew Post ◽  
T. Blaine Hoshizaki ◽  
Aisling Ní Annaidh ◽  
...  
Keyword(s):  
Laboratory Experiments ◽  
Brain Injuries ◽  
Field Tests ◽  
Impact Response ◽  
Standard Measurement ◽  
Response Characteristics ◽  
Certification Tests ◽  
Natural Turf ◽  
Compliant Surfaces ◽  
Drop Tests

Abstract The performance of equestrian helmets to protect against brain injuries caused by fall impacts against compliant surfaces such as turf has not been studied widely. We characterize the kinematic response of simulated fall impacts to turf through field tests on horse racetracks and laboratory experiments. The kinematic response characteristics and ground stiffness at different going ratings (GRs) (standard measurement of racetrack condition) were obtained from 1 m and 2 m drop tests of an instrumented hemispherical impactor onto a turf racetrack. The “Hard” rating resulted in higher peak linear accelerations and stiffness, and shorter impact durations than the “Soft” and “Heavy” ratings. Insignificant differences were found among the other GRs, but a strong overall relationship was evident between the “going rating” and the kinematic response. This relationship was used to propose a series of three synthetic foam anvils as turf surrogates in equestrian falls corresponding to ranges of GRs of (i) heavy-soft (H-S), (ii) good-firm (G-F), and (iii) firm-hard (F-H). Laboratory experiments consisted of a helmeted headform being dropped onto natural turf and the turf surrogate anvils using a monorail drop rig. These experiments revealed that the magnitudes and durations of the linear and rotational accelerations for helmeted impacts to turf/turf surrogates were similar to those in concussive sports falls and collisions. Since the compliance of an impacted surface influences the dynamic response of a jockey's head during a fall impact against the ground, it is important that this is considered during both accident reconstructions and helmet certification tests.

An Investigation of Hybrid III and Living Human Drop Tests

2000 ◽  
Vol 28 (1-2) ◽  
pp. 219-223 ◽  
Author(s):  
Keith Friedman ◽  
Fiona Gaston ◽  
Jack Bish ◽  
Donald Friedman ◽  
Anthony Sances, Jr.
Keyword(s):  
Hybrid Iii ◽  
Drop Tests

908-P: Predictive Model for Glycemic Level of People with Diabetes Mellitus Using Data Extracted from Electronic Medical Records in Primary Care

Diabetes ◽  
2020 ◽  
Vol 69 (Supplement 1) ◽  
pp. 908-P
Author(s):  
SOSTENES MISTRO ◽  
THALITA V.O. AGUIAR ◽  
VANESSA V. CERQUEIRA ◽  
KELLE O. SILVA ◽  
JOSÉ A. LOUZADO ◽  
...  
Keyword(s):  
Diabetes Mellitus ◽  
Primary Care ◽  
Predictive Model ◽  
Electronic Medical Records ◽  
Medical Records ◽  
Glycemic Level ◽  
Using Data
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