The Effects of Stress

摘要

In the last two columns we have discussed the effects of polymers, and we tookin the last two columns we have discussed the effects of temperature and time on the long-term behavior of polymers, and we tooka small side trip while covering the subject of time to treat the topic of strain rate.The third axis that completes the picture is stress. Normally we think of stress as a short-term property since data sheets provide information only at selected points on the stress-strain curve. These points usually involve a catastrophic event such as the point where the material yields or completely fails. However, this only tells us what we should not do with a material; it provides no guidance on what we can expect in a successful application.