「博士号を剥奪する」は to take a Ph.D. from someone と言えます。
例:
He had his Ph. D. taken from him because his research could not be validated.
「彼は研究を確証できず、博士号を剥奪された。」
Ph.D. で「博士号」Doctor of Philosophy の略
He lost his doctorate because his professor realized he had plagiarized some of his work.
「彼は他人の論文を盗用したことが教授にバレて、博士号を失った。」
lose one's doctorate 「博士号を失う」
plagiarize で「他人の文章・論文などを盗用する」
ご参考まで!