and they assembled a team to study the new material.
随后他们成立了一个小组,专门研究这种新型材料。
They gave the composite a real workout.
他们给这种合成材料做了次实验:
They compressed it five times a second for a week.
对该材料施加5.5倍的压力,时间持续一周,
That caused its stiffness to increase by 12%. Moreover,
结果材料硬度提高了12%,并且这种状态没有减弱的迹象。
the effect showed no sign of abating, which led them to suspect that if it were exposed tomore stress it would grow stiffer still.
研究小组由此设想,如果对其施以更大的作用力,这种材料的硬度是否会变得更高。
Why this happens is still a mystery.
产生这种效果的原因还是个谜。
Mr Carey and his colleagues report in the American Chemical Society s journal Nano thatheating the new material did not eliminate the response.
凯利和他的同事们发表在美国化工科学院的期刊杂志《Nano》的文章中说,即使对这种新型材料加热,也不能消除已产生的变化。
This suggests that the self-stiffening is not the result of chemical changes in the polymer,which can usually be undone by heat.
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