There is no material but will deform more or less under the

There is no material but will deform more or less under the action of forces.句中but 充当什么成分

ut可被看作关系代词,引导定语从句,在句中作主语,在意义上相当于 who not或that not,即用在否定词或具有否定意义的词后,构成双重否定.
再问： 这个句子怎么翻译呢？