You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "during which type of stretching does viscoelastic creep occur?" whose answer is a step constant stress.
Each document should contain about 30 words, and these documents should contain useful information.

Query: viscoelastic creep in stretching
Useful Output:

Doc 1: They exhibit a slow continuous increase in strain over time, or creep, when subjected to a constant stress and a slow continuous decrease in stress over time,
Doc 2: Summary of Dynamics - Engineering Dynamics · 3-2b: Simple Viscoelastic Models (Creep Compliance) · Failure Fatigue and Creep · How Airplane Wings
Doc 3: Overall, the findings indicate that four consecutive 30-s constant-torque stretches resulted in the same viscoelastic creep response.
Doc 4: A new method for determining creep parameters is proposed by using the special point on the creep curve and the definition of creep deformation.
Doc 5: Despite the otherwise creeping flow conditions, viscoelasticity leads to flow separation in the corners upstream of an isolated constriction (