التفاصيل البيبلوغرافية
| العنوان: |
Real-Time Full-field Deformation Analysis on the Ballistic Impact of Polymeric Materials Using High-speed Photogrammetry |
| المؤلفون: |
Yu, Jian H., Hsieh, Alex J., Dehmer, Peter G., Sands, James M. |
| المساهمون: |
ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE |
| المصدر: |
DTIC |
| سنة النشر: |
2010 |
| مصطلحات موضوعية: |
Ballistics, Mechanics, HIGH SPEED CAMERAS, STEREOPHOTOGRAMMETRY, PLASTIC DEFORMATION, BALLISTIC TRAJECTORIES, REAL TIME, IMPACT, SPECULAR REFLECTION, THREE DIMENSIONAL, DISPLACEMENT REACTIONS, ELASTOMERS, REPRINTS, STRESS STRAIN RELATIONS, TRACKING, envir, geo |
| الوصف: |
The dynamic deformation of transparent polymeric materials during the ballistic impact is investigated using a unique high-speed imaging technique. This technique involves the use of two high-speed cameras to record stereo images of a speckle patterned impact area and subsequent photogrammetric analysis. Photogrammetry is an image correlation technique that determines geometric properties, such as the displacement and strain history of a deformation event, by tracking the minute changes in the speckle pattern on the area of interest. These minute changes are then translated into three-dimensional displacement vectors as a function of time. Important mechanical behavior, such as strain or shear angle, can be calculated from the displacement vectors. By combining high-speed photography with photogrammetry, a full-field view on the strain as a function of time is made possible, and the strain can be resolved into components, such as the principle strain and shear strain. To demonstrate the capability of the high-speed photogrammetric technique, impact measurements on two different polymers were performed. A steel spherical projectile with a diameter of 5.54 mm and a weight of 0.692 g was used to impact a rigid polycarbonate (PC) and a flexible poly(urethane urea) (PUU) elastomer. The measurements were carried out at striking velocities between 100 m/s and 200 m/s, below the ballistic limits of both materials. At low impact speeds, the strain histories revealed that PC had a smaller deformation zone than PUU. At high impact speeds, it was observed that PC suffered a permanent strain deformation, whereas the strain in PUU relaxed over time. From these impact experiments, it is demonstrated that high-speed photogrammetry is able to capture the different strain behavior of these two polymers. These real-time strain histories cannot be easily observed quantitatively by other methods. ; Published in the Proceedings of the American Society for Composites 2009 (24th) Technical Conference, held in Newark, DE on 15-17 ... |
| نوع الوثيقة: |
text |
| اللغة: |
English |
| Relation: |
http://www.dtic.mil/docs/citations/ADA518511 |
| الاتاحة: |
http://www.dtic.mil/docs/citations/ADA518511 |
| Rights: |
undefined |
| رقم الانضمام: |
edsbas.1C600202 |
| قاعدة البيانات: |
BASE |