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3.91塑膠力學性質課是麻省理工學院聚合物材料專業研究生的一門主要課程。 它是材料科學和工程系聚合物項目的博士核心課程,也是麻省理工學院在聚合物科學和技術的跨系項目 (PPST) 。3.91課程是由F. J. McGarry 教授在1960年代開始講授的,且在麻省理工學院延續至今。 D. Roylance 教授自從20世紀70年代中期就共同講授該課,自McGarry教授在2002年6月退休後,他成了唯一的講師。

顧名思義, 3.91課程的目標是介紹與聚合物材料對外加載荷下回應有關的概念。包括分子力學和相關連續力學的數學描述。它以工程為主題,又兼有原子理論。課題內容大致與Ward 課本一致。
  • 聚合物結構
  • 彈性固體的變型
  • 類橡膠體的彈性
  • 線性粘彈性
  • 複合材料和層壓板
  • 屈服
  • 破裂

該課占3-0-9(編注:第一個3指上課時間,第二個0指複習課或實習課的時間,第三個9指預估學生必須在下課之後溫習或是準備的時間)學分,所以每一個學時要求近三個小時的課後學習。 這些課後學習包括通讀課程表指定的Ward 課本章節或 Roylance 模型,通常還有一個或更多工程問題。 對某日佈置的閱讀作業要在上課前完成,作業在下堂課交。(偶爾出於時間的緊迫,你或許要延遲一兩天,但請儘量避免。) 偶爾遲交不會被罰。 分數將基於上交的作業質量,課堂討論的積極性和三次考試。

學生做作業時共同協作是被允許和鼓勵的,但是繳交的所有作品應該由自己獨立完成。 從權威著作或其他資料複製是抄襲。鼓勵適當地用電腦解題;Maple對許多作業都適用。

沒有正式的複習課, 但是鼓勵你經常在教師辦公時間尋求幫助或進行一般討論。

3.91 Mechanical Properties of Plastics is one of MIT's principal graduate subjects in polymeric materials. It is a "core" subject in the doctoral Polymer Program of the Department of Materials Science and Engineering, and also the MIT interdepartmental Program in Polymer Science and Technology (PPST). 3.91 was developed originally by Prof. F. J. McGarry in the 1960's, and has been offered continually at MIT ever since. Prof. D. Roylance has co-taught the subject since the mid-1970's, and became the sole instructor with Prof. McGarry's retirement in June 2002.

As its name implies, 3.91 is aimed at presenting the concepts underlying the response of polymeric materials to applied loads. These will include both the molecular mechanisms involved and the mathematical description of the relevant continuum mechanics. It is dominantly an "engineering" subject, but with an atomistic flavor. The subject content will follow approximately that of the Ward text:
  • Polymer structure
  • Deformation of elastic solids
  • Rubber-like elasticity
  • Linear viscoelasticity
  • Composite materials and laminates
  • Yield
  • Fracture

The subject carries 3-0-9 credit, so approximately three hours of outside work should follow each lecture hour. These outside hours will include a thorough reading of various sections of the Ward text or Roylance modules as assigned in the Schedule, and often one or more engineering problems. The reading assigned for a given day should be complete before class, and the assigned problem should be turned in at the next class meeting. (Occasionally your personal schedule may force you to delay a day or two, but try to avoid this.) No penalty will be assessed for the occasional late submission. Grading will be based on the quality of the submitted problems, the vigor of your in-class discussion, and the three quizzes.

Student collaboration on homework is permitted and encouraged, but all work to be submitted should then be worked out and written up on your own. Copying from "bibles" or other such sources is cheating. Computer solutions are encouraged when appropriate; Maple is excellent for many of the assigned problems.

There are no formal recitations, but you are encouraged to make frequent use of the Instructor's office hours for assistance or just informal discussion.

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