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Mechanics of Materials 8th Edición
- ISBN-101111577730
- ISBN-13978-1111577735
- Edición8a
- EditorialCengage Learning
- Fecha de publicación1 Enero 2012
- IdiomaInglés
- Dimensiones8.25 x 1.5 x 10.25 pulgadas
- Número de páginas1056 páginas
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There are three main elements in understanding the subject:
1. Understanding the basic elements of statics; namely i. the sum of forces and moments equal zero, ii. stress is a force per unit area, iii. strain is a multiple of stress unless it is no longer so.
2. Applying geometry and trigonometry to static systems. This means having a good grasp of angles and distances so as best to allocate loads.
3. Paying attention to units. There is often a plethora of mixed units from lbs, N, kg, g, Pa, etc thus must be equated and often lead to either over or under stating the results.
That is it. There frankly is not much more. Like books covering this material for well over a hundred years this text does so as well. The coverage includes:
1. Stress and strain principles.
2. Applications to beams and cylinders. This is where getting the geometry correct starts to become important.
3. Bending of beams. This is the classic analysis of beams and determining maximum stress and seeing if one’s design is well within limits.
4. Columns and similar structures.
5. Indeterminate structures, the ones where there are an excess of givens.
6. Collapse and breakage.
These topics are all classic ones. The text is targeted at the undergraduate market.
I first took this material some fifty five years ago using a text by Shanley. The difference is striking. Let me list them:
1. Cost: The price then was in the single digits yet accounting for inflation the current text is 3 to 4 times more costly.
2. Pictures: Like so many texts this is filled with color pictures driving up the cost and actually distracting from the pedagogical approach. One wonders why the authors allow the publisher to embellish the text with a plethora of unrelated materials. Do the students today demand this entertainment?
3. Cohesion. The text covers the material expected but does so in my opinion in a somewhat confusing manner at times. This issue is enhanced at times by the layout of examples where the color and presentation make them unreadable and confusing.
4. Problems. In today’s environment there are many computer based approaches and tools that having hundreds of rote problems is questionable. Back in the late 50s and early 60s all we had was a slide rule. That in a sense reinforced structure. An engineer used engineering paper, paper with many small squares, to write down the problem, then draw the structure, lay out the approach to a solution and then step by step go through the process carefully checking units and calculations and finally underlining the answer for the grader. The process of doing this reinforces the concepts. Today there is a loose amalgam of back of the envelope calculations, spread sheets and even some home brewed programming. Thus perhaps the problems should be changed to reflect the design approach and not some set of PE Exam questions.
5. Focus. As one progresses through the material one jumps from a concept to an example to a set of questions. There is in my opinion a confusing jump from principles, extensions, and examples.
Overall the text does present the material, it is complete, and it can be obtained, albeit with some difficulty. I suspect that if one works through the problems one will do well on the PE exams. However there may be a disconnect from the academic and the practical.
I'm keeping it to study for the FE later.
This is still an OK book to learn the subject, but just prepare yourself to put a lot of effort and hours to get things right. I would recommend this book if you are able to work out the problems with your professor or T/A as they have the solutions and will help you understand better.
As with most textbook revisions, the only changes are minor - tweaked problem sets, different example problems, etc. But many of the new solutions are just plain wrong, which caused no end of headaches for my classmates and I. Additionally, the examples are often confusing and the layout is bad. There is just no attention to detail throughout.
Please, if you a professor, please don't force your students to buy this book. And if you are a student, try to convince your professor to go with a different textbook or at least an older edition.

