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Experimental and computational investigations of the potential improvement in helmet blast-protection through the use of a polyurea-based external coating

机译:通过使用聚脲基外涂层改善头盔爆炸保护的潜力的实验和计算研究

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Purpose - The design of the Advanced Combat Helmet (ACH) currently in use was optimized by its designers in order to attain maximum protection against ballistic impacts (fragments, shrapnel, etc.) and hard-surface/head collisions. Since traumatic brain injury experienced by a significant fraction of the soldiers returning from the recent conflicts is associated with their exposure to blast, the ACH should be redesigned in order to provide the necessary level of protection against blast loads. The paper aims to discuss this issue. Design/methodology/approach - In the present work, an augmentation of the ACH for improved blast protection is considered. This augmentation includes the use of a polyurea (a nano-segregated elastomeric copolymer) based ACH external coating. To demonstrate the efficacy of this approach, blast experiments are carried out on instrumented head-mannequins (without protection, protected using a standard ACH, and protected using an ACH augmented by a polyurea explosive-resistant coating (ERC). These experimental efforts are complemented with the appropriate combined Eulerian/ Lagrangian transient non-linear dynamics computational fluid/solid interaction finite-element analysis. Findings - The results obtained clearly demonstrated that the use of an ERC on an ACH affects (generally in a beneficial way) head-mannequin dynamic loading and kinematic response as quantified by the intracranial pressure, impulse, acceleration and jolt. Originality/value - To the authors' knowledge, the present work is the first reported combined experimental/computational study of the blast-protection efficacy and the mild traumatic brain-injury mitigation potential of polyurea when used as an external coating on a helmet.
机译:目的-设计者对当前使用的高级战斗头盔(ACH)的设计进行了优化,以最大程度地防止弹道撞击(碎片,弹片等)和坚硬表​​面/头部碰撞。由于最近冲突中返回的大部分士兵遭受的创伤性脑损伤与他们暴露于爆炸有关,因此应该重新设计ACH,以提供必要的防护水平,防止爆炸载荷。本文旨在讨论这个问题。设计/方法/方法-在当前工作中,考虑了ACH的增强以改善爆炸保护。这种增加包括使用基于聚脲(纳米分离的弹性体共聚物)的ACH外涂层。为了证明这种方法的有效性,对仪器化的甘露聚糖进行了爆炸实验(无保护,使用标准ACH进行保护,并使用聚脲抗爆炸涂层(ERC)增强的ACH进行保护。这些实验工作得到了补充结合适当的欧拉/拉格朗日瞬态非线性动力学计算流体/固体相互作用有限元分析结果-获得的结果清楚地表明,在ACH上使用ERC会(通常以有益的方式)影响人体模型动力学负荷/运动响应,通过颅内压力,冲动,加速度和颠簸来量化原创性/价值-据作者所知,本研究是首次报道了爆炸/爆炸保护效果和轻度创伤性脑的实验/计算组合研究用作头盔的外部涂层时,聚脲的伤害缓解潜力。

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