如果你google [sunroof shattered while driving] 可以找到各家廠商都有類似問題. 天窗無故爆裂.
有一篇是美國新聞台有請教柏克萊的機構工程教授, 據教授講
http://abc7news.com/archive/8026317/
========================================================== ..... He calculated a rock lofted into the air by a vehicle tire would reach a height of 10-15 feet and would have to come down at 70-80 miles an hour to break the sunroof.
"There is not a chance in the world that an unintentional rock that is lofted by a vehicle would ever break a sunroof panel," Zohdi said.
Zohdi says the maximum velocity of a rock coming down would be 25 miles an hour, well short of the needed 70 miles an hour. He said it is more likely the sunroof broke due to the stress caused by changes in temperatures or from fatigue............. =========================================================