Experimental and numerical analysis of tube-core claddings under blast loads

Theobald, M.D.; Nurick, G.N.

doi:10.1016/j.ijimpeng.2009.10.003

Cited by 51 publications

(34 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is to simulate the axial loading condition. The material used is aluminium 6063 T5, where the strain rate has no significant influence on the hardening behaviour up to 10 3 s -1 [28][29][30] . The mechanical properties are the Young's modulus E = 71000 MPa, yield stress  = 200 MPa and the density  = 2700 kg/m 3 .…”

Section: Finite Element Analysismentioning

confidence: 99%

Energy absorption capability of thin-walled aluminium tubes under crash loading

Khalili¹,

Tarlochan

Al-Khalifa³

2015

J. Mech. Eng. Sci.

View full text Add to dashboard Cite

This paper investigates the interaction of design factors such as tube thickness, tube length, and tube cross-sectional aspect ratio, along with friction and impacting mass on crashworthiness parameters such as specific energy absorption contact time, peak force and crush distance. The impact velocity is assumed to be constant at 15 m/s. The focus is on rectangular aluminium tubes and the analysis was carried out by using a validated finite element model. The analysis shows that the factors are not independent of each other and there is some degree of interaction between them. It was found that the trigger mechanism is a very important design factor to be included in the design of thin-walled tubes for energy absorption applications. The effect of the friction coefficient was found to be insignificant and finally, based on the interactions, it can be concluded that the most effective design would be a larger tube with small wall thickness, and a larger aspect ratio to avoid buckling.

show abstract

Section: Finite Element Analysismentioning

confidence: 99%

Energy absorption capability of thin-walled aluminium tubes under crash loading

Khalili¹,

Tarlochan

Al-Khalifa³

2015

J. Mech. Eng. Sci.

View full text Add to dashboard Cite

show abstract

“…Quite a few studies have been conducted to classify the energy absorption of composite tubes [12,13,14]. Additionally there have even been some studies, both numerical and experimental, where tubes or thin-walled structures of multiple geometries made of various materials (both metallic and composite) have been studied for use as sacrificial claddings for structures that undergo blast loading [15,16,17]. All of this research points to the fact that thin-walled structures, in a variety of geometrical patterns made of all kinds of materials, have numerous benefits to offer when it comes to protecting structures from blast loads.…”

Section: Figure 1: Mraps Deployed In the Field Versus Ied Casualtiesmentioning

confidence: 99%

“…Diffuse axonal injury was only evaluated using the de Olmos silver staining method. Although this approach is used extensively, additional procedures, e.g., immunohistochemical detection of phosphorylated tau protein and beta-amyloid precursor protein, could provide helpful validation(17,18). 5.…”

mentioning

confidence: 99%

Underbody Blast Models of TBI Caused by Hyper-Acceleration and Secondary Head Impact

Fiskum¹,

Fourney²

2014

View full text Add to dashboard Cite

Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. 15. SUBJECT TERMS 16. SECURITY CLASSIFICATION OF: 17. LIMITATION OF ABSTRACT 18. NUMBER OF PAGES 85 19a. NAME OF RESPONSIBLE PERSON USAMRMC a. REPORT b. ABSTRACT c. THIS PAGE 19b. TELEPHONE NUMBER (include area code) 1.1.3. Determine if alterations in vehicle hull design, particularly those that reduce both maximal G-force and JERK, reduce histologic, neurochemical, or behavioral indices of brain injury.2.0 Technical Requirements: Quantify physiologic, neurochemical, and neuro-histopathologic TBI outcomes after exposure of rats to underbody blast-induced hyperacceleration. Compare these outcomes to direct measurements of acceleration (G-force) and acceleration rate (JERK) to determine minimal and maximal survivable loads associated with TBI, to establish dose-dependence relationships, and to identify the neurobiologic alterations most closely linked with the pathophysiology of this form of TBI. (Aligned with Objective 1)2.1.1. Expose anesthetized test animals (rats) to defined degrees of blast-associated acceleration forces while secured on a metal structure that simulates a closed armored vehicle.Approximately 38 rats have been subjected to underbody blasts resulting in peak vertical accelerations ranging from 10 Gs to 2000 Gs. Accelerometer measurements confirmed target G forces for all but 3 blasts (6 rats). All rats survived these procedures and did not exhibit any external injuries. Two rats that were exposed to the 2000 G underbody blast exhibited evidence of minor lung hemorrhages when perfusion fixed at 7 days post-blast.2.1.2 Utilize a subset of animals for MRI and MRS measurements performed at one day prior to blast exposure (baseline) and again at several times post-blast. Eight of the rats exposed to 2000 G underbody blast were used for MRI/MRS measurements performed at baseline (one day prior to blast), and 2 hr, 24 hr and 7 days post-blast. Representative preliminary results from diffusion tensor imaging (DTI) and magnetic resonance spectroscopy (MRS) are shown in Figures 1 and 2. Mean diffusivity of water is reduced at 2 hr post-blast and returns to normal at 24 hr and 7 days. Axial diffusivity appear...

show abstract

“…the protected structure. Theobald and Nurick [5] studied the responses of tube-core claddings under blast loads by means of experimental blast tests, and found that panel crush distance increases with increasing impulse and decreases with an increasing number of tubes in the panel core. Palanivelu et al [6] studied crushing and energy absorption performance of different geometrical shapes of small-scale glass/polyester composite tubes under quasi-static loading conditions, and found that the corresponding energy absorption of the special geometrical shapes were better than the standard square and hexagonal geometrical shapes.…”

Section: Introductionmentioning

confidence: 99%