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weijiao木蟲 (正式寫手)
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新材料可顯著增強(qiáng)彈頭殺傷力 已有4人參與
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本報(bào)訊據(jù)美國(guó)物理學(xué)家組織網(wǎng)8月11日?qǐng)?bào)道，美國(guó)海軍研究辦公室（ONR）10日對(duì)外界公布了一種“革命性的新材料”，該材料能顯著增強(qiáng)彈頭的殺傷力并有望取代鋼成為制造彈頭的主要材料。 通過結(jié)合多種金屬材料的生產(chǎn)工藝，這種高密度活性材料（HDRM）可大幅增加彈頭殺傷力，并適用于大多數(shù)武器。不同于常規(guī)材料，這種材料制成的彈頭能在碰撞或穿透目標(biāo)表層后繼續(xù)釋放化學(xué)能，在一定程度上增加殺傷面積。 HDRM在強(qiáng)度上與普通鋁合金相當(dāng)，在密度上與低碳鋼相當(dāng)，這使其成為鋼構(gòu)件的理想替代品。這一點(diǎn)非常重要，因?yàn)樾虏牧现挥性诿芏壬媳M可能的與鋼類似才能更好的適應(yīng)現(xiàn)有發(fā)射系統(tǒng)并保持較好的精度。 美國(guó)海軍研究局項(xiàng)目官員克利福德·貝德福德介紹說，這種新材料在海軍導(dǎo)彈中得到了很好應(yīng)用，不但堅(jiān)固而且持久性好，能夠承受發(fā)射時(shí)產(chǎn)生的加速度和沖擊。在命中目標(biāo)后，由HDRM制成的彈頭碎片不但能刺透目標(biāo)的表層，還能將燃燒或爆炸保持一段時(shí)間。 由這種新材料制成的武器6月底在美國(guó)馬里蘭州的陸軍試驗(yàn)基地進(jìn)行了試射。美國(guó)海軍研究局計(jì)劃在8月中旬再進(jìn)行一次附加射擊測(cè)試，而對(duì)多個(gè)固定目標(biāo)的大規(guī)模測(cè)試預(yù)計(jì)將在9月進(jìn)行。 |
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金蟲 (正式寫手)
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High-Density Reactive Materials Reactive material weapon systems can be game-changers for the warfighter. The High-Density Reactive Material Program explores how enhanced potential energy density and energy coupled to the target will create new damage paradigms. Use of this technology can produce tailored energetic effects suitable to counter both conventional threats and peer-level challenges. The “tailoring” of a reactive material weapon system will depend upon the ability to understand and describe the properties of the reactive materials. Material tailoring will require macroscopic mechanical and chemical models, understanding of molecule dynamics, and developing strength/reactivity correlations. The impact on reaction mechanisms of varying material manufacturing methods must be determined. The strength, density, porosity, fracture, and aging will all impact the reaction and therefore the weapon’s effectiveness. http://www.onr.navy.mil/Science- ... tive-Materials.aspx Reactive material-from wiki Fragments or projectiles made of such materials have therefore greater damaging effect than inert ones, with expected lethality increase up to 500%. The material classes under investigation are thermites, intermetallic compounds, metal-polymer mixtures (e.g. magnesium/teflon/viton-like), metastable intermolecular composites (MIC), matrix materials, and hydrides.[1] These materials must be strong enough to act as structural components, be sufficiently stable to survive handling and launch, to penetrate a target, and sufficiently unstable to reliably ignite on impact. The mixtures under investigation include one or more finely powdered (down to nanoparticle size) metalloids or metals like aluminium, magnesium, zirconium, titanium, tungsten, tantalum, or hafnium, with one or more oxidizers like teflon or other fluoropolymer, pressed or sintered or bonded by other method to a compact, high-density mass. To achieve a suitable reaction rate and insensitivity to impact, friction, and electrostatic discharge, fuel particles have sizes usually between 1-250 µm.[2][3] A standard composition is aluminium-teflon (Al-PTFE). Metals which can form intermetallic compounds by an exothermic reaction are another class of candidate materials. An example is a laminate of thin alternating layers of aluminum and nickel, commercially available as NanoFoil. |
2樓2011-08-31 20:28:18
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3樓2011-08-31 20:28:34
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