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Project Summary

Difficulty  6  –  8 
Time required Long (a couple of weeks)
Prerequisites None
Material Availability Readily available
Cost Low ($20 - $50)
Safety Minor injury possible: keep hands and feet clear when testing strength of finished structures.


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Abstract

Here's a project for a budding architect or structural engineer. Can you make a strong, lightweight tower using only uncooked spaghetti and white glue? In this project, you'll learn about materials testing and apply what you learn to building and testing structures that are both strong and light.

Objective

The overall goal of this project is to test different methods for building structures that are both strong and light. You will use the same basic building materials (pasta and white glue), but you will put them together in different ways. Make at least three structures of similar size (outer dimension volume approximately 8000 cm3) and test to see which has the best strength-to-weight ratio.

It is suggested that you investigate material strength at two levels:

  1. What are the best shapes and sizes for the "beam" components which will be used to build the final structure?
  2. What are the best geometric designs for combining the beam components in order to create structures that are both strong and light?

Introduction

Engineers have many good reasons for testing the materials used to build structures and devices. Each of the following questions can be answered with well-designed materials tests:

Materials testing often involves deliberately breaking things, which can be fun, as we all know. In order to get good information about the strength and other properties of the material under study, it's important to carefully control the conditions of the test. Any applied force must be measured, for example. The "Stress, Strength and Strain" resource in the Bibliography is highly recommended for background information on how engineers measure and talk about material properties.

In this project, your goal is to test different ways of making structures that are both strong and light. Your building materials will be uncooked spaghetti and white glue.

You'll start by measuring the strength of beams made from strands of spaghetti. One strand of spaghetti snaps pretty easily (in fact, you can find out just how much force it takes). What happens when you glue strands together to make multi-strand beams? Does linguine work better than spaghetti? Which beams have the best strength-to-weight ratio? Which beams will be easiest to attach together to build a strong and light structure?

Then, using the components you designed in the first step, build and test a series of at least three structures (outer dimension volume approximately 8000 cm3) and determine which has the best strength-to-weight ratio. You will be testing to see how much weight each structure can bear before collapsing, so the structures will need to have a flat surface on top on which to place the weights.

Terms, Concepts and Questions to Start Background Research

To do this project, you should do research that enables you to understand the following terms and concepts:

Questions

Bibliography

Materials and Equipment

To do this experiment you will need the following materials and equipment:

Experimental Procedure

  1. Do your background research and make sure that you understand the terms and concepts and can answer the questions above.
  2. Choose the best beam design(s) to construct your structures. For testing strength of individual beam designs, follow the methods used in: Strength in Numbers?.
  3. Design and build three different structures with your pasta components.
  4. Weigh each structure before testing.
  5. Test how much weight each structure can bear before collapsing. Observe carefully and try to identify which component(s) of your structures fail. (Safety note: keep hands and feet clear when testing your structures.)
    1. Place the wood platform on top of the structure to be tested.
    2. Place the bucket on top of the platform, and slowly add with water (or sand) until the structure gives out.
    3. Weigh the bucket, water and wood platform to determine the amount of weight that caused the structure to fail.
  6. Which structure had the best strength-to-weight ratio?

Variations

Credits

Andrew Olson, Ph.D., Science Buddies


Last edit date: 2006-02-23 12:35:55


Career Focus

If you like this project, you might enjoy exploring careers in Materials Science.

Civil Engineers
If you turned on a faucet, used a bathroom, or visited a public space (like a road, a building, or a bridge) today, then you’ve used or visited a project that civil engineers helped to design and build. Civil engineers work to improve travel and commerce, provide people with safe drinking water and sanitation, and protect communities from earthquakes and floods. This important and ancient work is combined with a desire to make structures that are as beautiful and environmentally sound, as they are functional and cost-effective.
  Materials Scientist and Engineer
What makes it possible to create high-technology objects like computers and sports gear? It's the materials inside those products. Materials scientists and engineers develop materials, like metals, ceramics, polymers, and composites, that other engineers need for their designs. Materials scientists and engineers think atomically (meaning they understand things at the nanoscale level), but they design microscopically (at the level of a microscope), and their materials are used macroscopically (at the level the eye can see). From heat shields in space, prosthetic limbs, semiconductors, and sunscreens to snowboards, race cars, hard drives, and baking dishes, materials scientists and engineers make the materials that make life better.

Architect
The essayist and poet Ralph Waldo Emerson called Greek architecture the "flowering of geometry." Architects blend art and science, designing structures for people, such as houses, apartments, schools, stores, malls, offices, places of worship, museums, sports stadiums, music theaters, and convention centers. Their designs must take into account not only the structure's appearance, but its safety, function, environmental impact, and cost. Architects often participate in all phases of design, from the initial consultation with the clients where the structure is envisioned, to its completion. Architects can enrich people lives by creating structures that are as beautiful to look at as they are functional to live, work, or shop in.
 



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