自我修复材料即将问世-凯发k8官网

you've seen it in movies: the human-like, robot assassin（刺客） quickly ² its structure after being damaged beyond recognition. this "terminator" ³ is becoming less far-fetched as recent advances in ⁴ health monitoring systems have led to a variety of ways to identify damage to a structural system. now, in the journal of ⁵ physics, researchers at arizona state university have created a material that may be able to not only sense damage in structural materials, such as cracking in a fiber-reinforced composite（复合材料，合成物） , but to even heal it. the aim of developing "⁶ adaptive structures" is to ⁷ the ability of biological systems such as bone to sense the presence of damage, halt its progression, and ¹ itself.

the novel autonomous material developed by henry sodano and colleagues uses "shape-memory" polymers（聚合物） with an ⁸ fiber-optic network that functions as both the damage detection ⁹ and ^{10 11} delivery system to produce a response that ¹² the advanced ¹³ and healing traits shown in biological systems. an ¹⁴ laser transmits light through the fiber-optic system to locally heat the material, ¹⁵ the toughening and healing ¹⁶.

the material system is capable of increasing the toughness of a ¹⁷ by 11 times. after toughening the specimen, the crack can be closed using the shape-memory effect to recover an ¹⁸ 96 percent of the object's original strength. in fact, after the crack is closed, the new material is nearly five times as tough as the original specimen, even though it has been strained past its original failure strain point by a factor of four. the material and healing process can be applied while the structure is in operation, which has not been possible with existing healing techniques.