2006年欧洲数学学会的《MATH》对我校俞茂宏教授的英文学术著作《Unified Strength Theory and Its Application统一强度理论及其应用》发表了评价。《MATH》是欧洲数学学会主办的数学文摘，创办于1931年，对象包括世界各国的数学和力学论著。评论的英文和中文译文如下。
    “强度理论主要研究应力和应变的极限状态，以便与容许的应力和应变进行比较。单轴实验和单轴的结果已不够，而需要双轴和三轴的研究。因为，不同的材料在复杂应力-应变下具有不同的力学性能，这时，屈服准则和破坏准则将起到重要的作用。这些理论的作用是保证土木和机械结构的安全。 但是，这些理论一般只能应用于少数材料和应力-应变状态，它们不能解决可能产生的各种问题，因此需要去探索统一强度理论。”
    “本书从双剪思想和双剪屈服准则开始，作者先后建立了双剪强度理论和统一强度理论。统一强度理论的极限线覆盖了外凸极限线的全部区域，并且可以扩展到非凸极限线的区域。这本书不仅是理论、实验、应用和历史的论述，而且是作者独特研究的专门著作。这些可以从书的目录中明显反映出来。书的各章目录为：1 绪论；2.单元体应力状态；3. 统一屈服准则；4.屈服准则的验证；5. 统一屈服准则的扩展；6.材料在复杂应力状态下的基本特性；7. 统一强度理论；8.强度理论的实验验证；9. 统一屈服准则的应用；10.结构分析的破坏准则效应；11.历史评论；12.参考文献和书目。各章后面有一个小结和与重要内容有关的习题。最后一章包括历史评论和从1638年到2002年的超过1000种的完整的书目”。
    “这本书的对象是广泛领域的读者。这本书代表了这一领域的一个重要贡献。”

对应英文如下：
    “Strength theories focus on the limit states of stress and strain in order to compare them with admissible stresses and strains. Uniaxial experiments and results are no more sufficient, and two- or three-axial studies are needed. Because different materials have different mechanical behaviour under complex stress-strain states, yield criteria and failure criteria play an important rule. The goal of these theories is to ensure the safety of civil and mechanical structures. But--in general--such a theory can be applied to a small number of materials and states of stress and strain in their deterministic aspects, and does not cover the area of all problems which may arise, so that unified theories have been searched.
    Here, starting from the idea of twin-shear and twin-shear yield criterion, the author sets up a twin-shear strength theory and then a unified strength theory, the limit loci of which cover all regions of the convex limit loci and can be extended to the region of non-convex limit loci. The present book is not only a presentation of the theory, experiments, applications and history, but also a monograph on the own research of the author as it can be put in evidence by its contents, i.e.: 1. Introduction; 2. Stress states of elements; 3. Unified yield criteria; 4. Verification of the yield criterion; 5. Extended unified yield criterion; 6. Basic characteristics of strength of materials under complex stress; 7. Unified strength theory; 8. Experimental verification of strength theory; 9. Applications of the unified yield criterion; 10. The effects of failure criteria on structural analysis; 11. Historical reviews; 12. References and bibliography. Each chapter is followed by a summary and problems which concern the most important items. The last chapter contains a historical discussion and an exhaustive bibliography of more than thousand titles covering the interval 1638-2002.
    The book is intended to a large community of readers and represents an important contribution to the field”。