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    程时能理解他。
    到处受挫,连一颗小小螺栓都能把人卡住的感觉十分不好受。
    他安慰马常胜:“不要慌,知道问题在哪儿就好办了,一个一个解决就是。你慢慢说。”
    马常胜:“钛合金冶炼缺陷和表面处理技术落后的问题都是一样的。精密加工能力的不足,已经用给你给我们的小型精密数控机床缩小了差距。”
    “但是现在还存在许多其他问题。比如填充工艺缺陷导致装药密度不均匀,从而使爆炸能量不稳定。”
    “闭气结构很容易失效。导致气体外泄,弹射座椅分离延迟。”
    “螺丝断裂的地方和时机总是跟我们设计的效果差别很大。”
    程时又忍不住皱眉:这三个故障太坑了,会直接导致飞行员逃生失败,出现重大伤亡。
    他问:“没有模拟爆炸冲击载荷吗。”
    马常胜:“没有合适的装置。所以只能做静态模拟。最后发现实际断裂时间比静态测试长很多。”
    程时:“没有霍普金森杆装置吗?”
    马常胜又有点懵:“什么?”
    程时拿了一支笔在旁边边画边说:“霍普金森杆的技术原理是基于英吉利的物理学家1914年提出的‘应力波传播理论’制作的实验装置。本质是利用一维弹性应力波的传播、反射与透射规律,间接测量试样在动态载荷下的应力-应变关系。”
    “这个装置通过撞击杆高速撞击入射杆,在入射杆内产生一束压缩应力波或拉伸应力波,模拟爆炸冲击载荷。入射应力波沿入射杆传播至位于入射杆与透射杆之间试样,比如我们要测试的爆炸螺栓。一部分应力波穿过试样进入透射杆,称为透射波,另一部分因试样与杆的阻抗差异反射回入射杆,称为反射波。”
    “若试样发生塑性变形,会吸收部分能量,导致透射波幅值小于入射波。在入射杆和透射杆上粘贴高精度应变片,实时采集应力波的应变信号。反射波的幅值与相位则反映试样的动态响应特性,比如屈服强度、应变硬化率。就能模拟爆炸的时候,爆炸螺栓内部的应力变化。看看爆炸螺栓的受力峰值到底出现在什么时候,来设计炸药的量和点火时间。”
    “这个装药的密度,可以用液压伺服压药机和更精确的称量系统,比如电子天平系统。如果还不行,可以在填充之后,放在高频振动台上震动一下。不过这个步骤需通过振幅限制和惰性气体保护,还要做静电防护设计以及降低风险。”
    “闭气结构改成金属波纹管和聚四氟乙烯密封环组合结构。这个机构耐高、低温性能好,闭气稳定性提升。我跟核电站和化工厂也说过,你可以问问他们有没有找到合适的四氟乙烯密封环,直接拿来用就好了。”
    马常胜:“还有最后一个问题,电爆管桥丝断裂,失效概率比较高。”
    程时:“这个可能是环境应力引起的。因为你们实验的时候,温度湿度和振动情况都跟在舰载环境不同。要增加综合实验体系进行环境应力筛选。”
    “也有可能是电阻精度不够,或者因为机舱内电磁干扰太多,可以在导线包裹镀镍铜屏蔽层来防止电磁干扰。确保能通过1000V绝缘测试,电爆管的可靠性就能提高很多。”
    马常胜轻叹:“地面测试也只能测试火箭助推和爆炸螺栓组合的弹射性能。可是哪怕在地面测试弹射座椅无数遍,也没办法在空中测试,因为代价太大。还有气囊式腰椎支撑,抗荷服的各种功能也没有办法得到真切的感受。”
    在高空测试弹射座椅的代价是一架战斗机坠毁和一个飞行员的安全,还有不可预测的地面伤亡。
    程时想了想:“其实有办法的。可以做个仿生人体模型。参考德意志和漂亮国用来做汽车冲撞实验的假人。以中国人的成年男性标准身高体重作为基本参数。用铝合金框架做骨骼,聚氨酯泡沫与乙烯基材料做成肌肉和皮肤。所有关节和人体骨架一样。颈椎如果能用弯曲杆和橡胶阻尼结构来复现人类颈部过载下的弯曲变形就更好了。”
    “然后在皮肤和各个主要关节部位以及内脏布置温度和应力传感器来测试具体数值。哪怕在天空测试的时候,可以把假人穿上抗荷服放在双座战斗机的后座上,由飞行员操控按下弹射按钮,把假人弹出去。测试稳定伞和弹射过程中飞行员实际的受力情况。在假人身上安装追踪器,在假人落地后,还能收回来做详细检测。”
    马常胜呆愣了片刻,说:“听着不错。可是我们没有精力来造了。”
    他满怀期望的望着程时,希望程时识趣一点,主动把这个活接过去,他就不用求程时,不用被程时敲诈了。
    程时想了想,说:“没事,我帮你忽悠一个人来做。”
    马常胜捉住程时的手用力握了握:“时哥,你真是太好了。谢谢你啊。你打算找谁。他的技术能力够吗?”
    这东西不
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