Basics of Rheology

What is Rheology? – Episode 1

In the first episode on rheology basics, the focus is on how materials deform and flow under force. The concept of viscosity is introduced, highlighting the differences between Newtonian and non-Newtonian materials, with examples like water and honey. The episode explains viscoelasticity, which combines properties of viscous and elastic materials, and discusses how most materials exhibit rate-dependent behavior. Stress and strain are defined, along with their relationship through the modulus. The episode concludes with a teaser for the next installment.

Basics of Rheology – Episode 2

In this episode of the basics of rheology, the focus is on measuring viscoelasticity using rheometers instead of viscometers. Rheometers apply force or motion to materials and measure their responses through raw signals like torque and angular displacement. The episode explains the importance of translating these signals using rheometry software and highlights the three types of deformation: rotational, transient, and oscillatory. It emphasizes the advantages of rheometers, such as better temperature control and the ability to detect small torques, which are crucial for studying delicate material behaviors. The episode concludes by mentioning the different types of rheometers available and their applications.

Basics of Rheology – Episode 3

In this episode of the basics of rheology, the focus is on uncovering the properties of a mysterious material, starting with viscosity. The flow sweep test is introduced to measure viscosity profiles, distinguishing between Newtonian and non-Newtonian fluids. The importance of defining the linear viscoelastic region (LVR) is emphasized, where the material’s response to small deformations is linear and reversible. Through oscillatory tests, the material’s behavior is analyzed using the concepts of storage and loss modulus, illustrated with examples like syrup and PDMS. The episode concludes by outlining the steps to analyze an unknown material and hints at further exploration in the next episode.

Basics of Rheology – Episode 4

In this episode, the focus is on the importance of identifying the linear viscoelastic region (LVR) for conducting rheological tests. The video explains how frequency sweep tests assess material responses to varying time scales of deformation, measuring key parameters like storage modulus and tan delta to determine material behavior. Time sweeps are introduced as a method to observe material evolution over time, particularly during curing processes, while temperature ramps help analyze thermal transitions. The episode concludes by hinting at the next topic, which will cover transient tests such as creep and stress relaxation.

Basics of Rheology – Episode 5

In the final episode of the Basics of Rheology, the focus is on transient tests that demonstrate how materials relax, recover, or deform permanently. The narrator explains the concept of elasticity and how viscoelastic materials behave between elasticity and viscosity. Through examples like orthodontic braces and asphalt under traffic, the episode illustrates how materials respond to stress over time. The series concludes by emphasizing the complexity and enjoyment of studying rheology.

Beyond the Basics

Beyond the Basics Episode 1: Yield Stress & Wall Slip

Yield stress is one of the most important—yet often misunderstood—properties in rheology, influencing everything from whether a coating sags to whether a 3D‑printed layer holds its shape. In this first episode of Beyond the Basics, we dig into what really defines yield‑stress behavior, explore the difference between dynamic and static yield stress, uncover how wall slip can distort your measurements, and share practical guidance for choosing the right testing approach. If you work with gels, pastes, coatings, or food products, this episode gives you the clarity you need to measure yield stress with confidence.

Beyond the Basics Episode 2: Thixotropy

In Episode 2, we take the next step into one of the most fascinating topics in rheology: thixotropy. This behavior appears everywhere—from coatings and food to 3D printing materials. So, what is thixotropy? Let’s go back to a simple example: paint. When you roll it onto a wall, you want it to thin just enough to spread smoothly. But if it rebuilds too quickly, you’ll see brush marks. If it rebuilds too slowly, it will sag and drip. Thixotropy closely ties together with yield stress and wall slip. These effects are deeply interconnected, and understanding how they influence each other is key to making your rheology measurements both reliable and meaningful.

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先进的Discovery ARESG3流变仪代表着流变学领域的新高度，在更广泛的测试条件下提供更清晰、更精准的数据。基于55年的流变技术创新传承，ARESG3采用前沿技术与高精度硬件，能够以更少的数据修正捕捉材料的真实行为，从而获得更准确、更可靠的结果。

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探索日常生活中的流动科学

第1期

沙堡

探索沙堡背后的流变学奥秘，请阅读：沙堡科学。

第2期

圆周率日（Pi Day）

了解圆周率日（Pi Day）与流变学的关联，请阅读：流变学，小“派”一碟。

第3期

排灯节（Diwali）

感受排灯节（Diwali）中的流变学魅力，请阅读：流变学即“玛萨”（趣味）。

第4期

农历新年

发现农历新年的流变学趣味，请阅读：流变学很“有趣”。

第5期

咖啡

深入咖啡粉末的流变世界，请阅读：咖啡粉末中的流变学。

E第6期

防晒霜

警惕不良流变数据的潜在危害，请阅读：别让不良流变数据“晒伤”你。

第 7 集

巧克力

如需深入了解巧克力的流变学知识，请查阅我们的博客文章：巧克力罗曼史：流变学视角。

第 8 集

德博拉数

若想结合德博拉数深入了解流变学，请查阅我们的博文：德博拉数、Chirp 模式与回弹性。

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