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El. knyga: Review of Department of Defense Test Protocols for Combat Helmets

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  • Formatas: 158 pages
  • Išleidimo metai: 31-Mar-2014
  • Leidėjas: National Academies Press
  • Kalba: eng
  • ISBN-13: 9780309298698
Kitos knygos pagal šią temą:
Review of Department of Defense Test Protocols for Combat HelmetsDidesnis paveikslėlis
  • Formatas: 158 pages
  • Išleidimo metai: 31-Mar-2014
  • Leidėjas: National Academies Press
  • Kalba: eng
  • ISBN-13: 9780309298698
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Combat helmets have evolved considerably over the years from those used in World War I to today's Advanced Combat Helmet. One of the key advances was the development of aramid fibers in the 1960s, which led to today's Kevlar-based helmets. The Department of Defense is continuing to invest in research to improve helmet performance, through better design and materials as well as better manufacturing processes. Review of the Department of Defense Test Protocols for Combat Helmets considers the technical issues relating to test protocols for military combat helmets. At the request of the DOD Director of Operational Test and Evaluation, this report evaluates the adequacy of the Advanced Combat Helmet test protocol for both first article testing and lot acceptance testing, including its use of the metrics of probability of no penetration and the upper tolerance limit (used to evaluate backface deformation). The report evaluates appropriate use of statistical techniques in gathering data; adequacy of current helmet testing procedures; procedures for the conduct of additional analysis of penetration and backface deformation data; and scope of characterization testing relative to the benefit of the information obtained.
Summary 1(7)
1 Introduction
8(3)
1.0 Information Gathering
8(1)
1.1 Summary of the Report
8(2)
1.2 References
10(1)
2 Evolution of Combat Helmets
11(4)
2.0 Summary
11(1)
2.1 Introduction
11(1)
2.2 New Materials and Designs
11(2)
2.3 Recent Developments and Directions
13(1)
2.4 References
14(1)
3 Threats, Head Injuries, and Test Methodologies
15(10)
3.0 Summary
15(1)
3.1 Introduction
15(1)
3.2 Historical Patterns of Treatable Injuries
15(2)
3.3 Threats
17(3)
3.4 Advanced Combat Helmet Test Methodology and Links to Biomechanics
20(3)
3.5 References
23(2)
4 Combat Helmet Testing
25(7)
4.0 Summary
25(1)
4.1 Introduction
25(1)
4.2 Ballistic Testing Methodology
25(2)
4.3 Sources of Test Variation
27(2)
4.4 Additional Measurement and Testing Issues
29(1)
4.5 References
30(2)
5 Helmet Performance Measures and Trends in Test Data
32(7)
5.0 Summary
32(1)
5.1 Introduction
32(1)
5.2 Performance Measures
32(2)
5.3 Summary of Results from Available Test Data
34(3)
5.4 Implications for First Article Testing Protocols
37(1)
5.5 References
38(1)
6 First Article Testing Protocols For Resistance To Penetration: Statistical Considerations and Evaluation of Dod Test Plans
6.0 Summary
39(1)
6.1 Introduction
39(1)
6.2 Statistical Considerations in Designing Test Plans for Resistance to Penetration
39(3)
6.3 Statistical Evaluation of DoD Protocols for Resistance to Penetration
42(3)
6.4 Examination of Separate Test Plans by Helmet Size
45(1)
6.5 Post-Test Analysis
46(1)
6.6 Future Test Protocols: Helmet as the Unit of Test
46(1)
6.7 References
47(1)
7 Test Protocols For Backface Deformation: Statistical Considerations and Assessment
48(6)
7.0 Summary
48(1)
7.1 Introduction
48(1)
7.2 Backface Deformation First Article Acceptance Testing Protocols and Their Properties
48(3)
7.3 Discussion
51(3)
8 Lot Acceptance Testing
54(10)
8.0 Summary
54(1)
8.1 Introduction
54(1)
8.2 Lot Acceptance Testing Protocols
54(2)
8.3 Evaluating Performance: Comparison of Operating Characteristic Curves
56(2)
8.4 ANSI Standard and the Acceptance Quality Limit
58(2)
8.5 Using the Helmet as the Unit of Testing
60(3)
8.6 References
63(1)
9 Characterization Tests for The Advanced Combat Helmet and Future Helmets
64(6)
9.0 Summary
64(1)
9.1 Introduction
64(1)
9.2 Characterization of the Advanced Combat Helmet Using Existing Test Data
65(1)
9.3 Expanded Characterization Requiring Additional Data
65(2)
9.4 V50 Testing
67(1)
9.5 Comparison with Industrial Practices
68(1)
9.6 Concluding Remarks
69(1)
9.7 References
69(1)
10 Linking Helmet Protection to Brain Injury
70(21)
10.0 Summary
70(1)
10.1 Introduction
70(1)
10.2 Brain Injuries
70(3)
10.3 Head and Brain Injury Tolerances
73(1)
10.4 Brain Tissue Injury: Experimental Results
74(7)
10.5 Computational Modeling and Simulation
81(3)
10.6 Mechanical and Constitutive Properties of Tissues
84(1)
10.7 Conclusion
85(1)
10.8 References
86(5)
APPENDIXES
A Study Origination Documents
91(6)
B Protocols for First Article and Lot Acceptance Testing
97(25)
C Committee Meetings and Data-Gathering Activities
122(2)
D Test Range Description and the Ballistic Testing Process
124(8)
E Synopsis of Brain Injury Detection Methods
132(6)
F Biographical Sketches of Committee Members
138
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