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L = unsupported beam length = 400 mm
      total length is 500 mm, supports 50 mm from ends
b = beam width = 100 mm
h = beam height = 24.7 mm
E = Modulus of elasticity = 9.03x10¹⁰ Pa = 9.03x10⁴ N/mm²
I = Moment of Inertia = b*h³/12 = 1.26x10⁵ mm⁴
EI = (9.03x10⁴*1.26x10⁵) = 1.13x10¹⁰ N mm²
Z = Section Modulus = I/(h/2) = 1.02x10⁴ mm³
W = central load = 0.5 Kg = 4.9 N/mm²

x = point coordinate relative to support
Y(x) = deflection = (Wx/48EI)(3L² - 4x²)
S(x) = extreme fiber stress = -Wx/2Z

Calculate central deflection and stress: x = L/2
Ycent =  Ymax = Y(L/2) = WL³/48EI= (4.90*400³)/(48*1.13x10¹⁰) = 580 nm
                            
See Beam Test Data 2 in good agreement

Scent = Smax = -WL/4Z= -(4.90*400)/(4*1.02x10⁴) = .048 N/mm² = 5x10³ Pa

The Schott web site lists bending strengths for bonded Zerodur pieces in the range of 25 to 50 MPa; an older Schott publication listed Zerodur bending strengths of 70 to 120 MPa depending on surface finish.

Tilt = T = dY/dx = d/dx[(W/48EI)(3xL²-4x³)] = [W/16EI](L² - 4x²) 
                with max at supports, minimum at center 
Tmax = T(0) = WL²/16EI = (4.90*400²)/(16*1.13x10¹⁰)= 4.3 microradians
Tcent = T(L/2) = 0

See Beam Test Data 1, in good agreement.